X. PROFESSOR HULK STRENGTH
The Professor Hulk. Originally thought to be a merger of the Banner, Savage Hulk and Gray Hulk identities, it was later revealed that this persona was a wholly distinct fourth one.
The Professor Hulk possessed all of Banner's intellect, the Savage Hulk's strength and Mr. Fixit's attitude. Due to brain damage caused by shrapnel, the Professor Hulk persona would warp into the Maestro, a self-styled villain for the rest of the world to unite against. In terms of strength, the Professor Hulk actually started off much stronger than the Savage Hulk. He also could ramp up his strength at a rapid pace. The only limiting factor to his strength was a mental fail-safe he created: should he completely lose control and become overly enraged, he would revert back to puny Banner.
LIFTING
It bears repeating that Professor Hulk was stronger than Savage Hulk, and various authorities were acutely aware of this, "Actually, he's bigger, greener, and stronger than ever." From Incredible Hulk #391:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Hulk/HulkRespect09391.jpg
Professor Hulk is strong enough to toss around Dr. Octopus despite the latter's adamantium tentacles, from Spider-Man #23:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Hulk%20Strength/ProfessorHulkLifting01Spiderman23.jpg
Even at a standstill, he can easily drag around Dr. Octopus in an almost casual manner, from Incredible Hulk #396:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Hulk%20Strength/ProfessorHulkLifting02396.jpg
A cliffside's worth of rubble poses little obstacle to Professor Hulk in Tales to Astonish #1:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Hulk%20Strength/ProfessorHulkLifting03TTA1.jpg
http://i388.photobucket.com/albums/oo326/OneDumbG0/Hulk%20Strength/ProfessorHulkLifting04TTA1.jpg
PRESSING
In a friendly match of arm-wrestling, Thing visibly and audibly strains to gain an edge... and completely fails to budge him to the casual amusement of Professor Hulk in Incredible Hulk Annual #18:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Hulk%20Strength/ProfessorHulkPressing02Annual18.jpg
The Toad Men's magnetic repulsion weapons designed to lock onto the hemoglobin in his body fail to hold back Professor Hulk in Over The Edge #3:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Hulk%20Strength/ProfessorHulkPressing03OverTheEdge3.jpg
Professor Hulk can exert so much pressure that he can press straight through an all-out Vector's attack even when he's literally reduced to a near skeletal state in Incredible Hulk #398:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Hulk%20Strength/ProfessorHulkPressing01398.jpg
FLEXING
The lack of leverage poses little problem to Professor Hulk. Here he easily breaks out of a reverse bear hug from Ajax in Incredible Hulk #381:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Hulk%20Strength/ProfessorHulkFlexing01381.jpg
Professor Hulk clowns X-Factor's Strong Guy with a swift headlock in Incredible Hulk #391:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Hulk%20Strength/ProfessorHulkFlexing02391.jpg
When he wrestles with his old foe, Glob, Professor Hulk states matter-of-factly that he's now much stronger... and Glob clearly believes it in Incredible Hulk #389:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Hulk%20Strength/ProfessorHulkStrength01389.jpg
The monstrous Man-Thing attempts to smother Professor Hulk with his body but is violently flexed off in Incredible Hulk #428:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Hulk%20Strength/ProfessorHulkFlexing03428.jpg
The Toad Men's magnetic cage forced tremendous pressure but even without any sort of leverage, Professor Hulk manages to flex and exert sufficient counter-pressure to overload the machine and free himself in Over The Edge #3:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Hulk%20Strength/ProfessorHulkFlexing04OverTheEdge3.jpg
TEARING
Poor Spider-Man, his webs are quite literally useless against Hulk. And that includes Professor Hulk, who tears right through two cartridges worth of em with a single hand in Amazing Spider-Man #382:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Hulk%20Strength/ProfessorHulkTearing01ASM382.jpg
Even Venom's stronger webbing is about as useful as spit as shown in Incredible Hulk Vs Venom #1:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Hulk%20Strength/ProfessorHulkTearing02IHvsVenom1.jpg
The very bedrock underground is easily tunneled through with his bare hands, from Incredible Hulk #411:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Hulk%20Strength/ProfessorHulkTearing03411.jpg