Ok... um... didn't I just list for you a bunch of planet busters?
"To my knowledge he has exchanged blows with thor with the power gem, champion with the power gem, silver surfer, firelord, nate grey, hulk, parallax (which i dont know the details of but seems a little off..), a fed galactus."
surfer has, champion has by your own admission i think. hulk destroyed an asteroid that was like a 1/3 the size of Earth? something like that. A small planet anyway. Thor has lifted the midgard serpent or whatever which is comparable in size to a planet (being a good guy I would hope he doesnt' blow up planets a lot..). I seriously hope i dont have to argue GALACTUS's power or parallax's. So thats 3 confirmed. 2 you got to be kidding me if you dont think they can do it. and thor.
If you paid attention I meant comics in general have the black hole feat. Superman has held one. Think some herald of galactus has survived in one. Godzilla like lived in one or something (that was just weird). Silver surfer went through one. It happens a lot (even though it shouldn't).
And I know it takes practice to tap into the gems fully. Did I ever say that they gave you all their power right away? All i did was mention that thor and champion had it. I assume they give you some power though without too much practice. I thought someone here gave an estimate but I dont know. either way I never argued or mentioned the point that it gave u indestructable power right away. Even if it does nothing to your strength it's still a feat to beat thor and champion (well champion jobs a lot I think but he's technically really good). Ask someone else for how much the gem gives u right away if you really want to know.