I have a few points to make
1. Zeus obviously reduced Hulk's HF. If Hulk's Hf is operating anything like normal, once the fight is over he should heal right back up, as long as the force that caused the damage was purely physical (as opposed to having a magical effect) There is no way that damaged caused by Zeus' punches should have completely overtaxed Hulk's HF, going by previous showings. In WWH The Hulk continued to fight while hsving holes punchd through him by Zom/Strange. This was similar to the damage he got from Zeus. In #398 of Incredible Hulk, the Merged Hulk had most of the flesh flayed off his bod by Vector of the U Foes. He recovered/regenerated in seconds.
2.Durability and HF are 2 different things. The Hulk has shown immense durability over the years. His HF enables him to recover when he encounters forces which are strong enough to overcome his durability. Falling onto rocks from a great height should not damage him at all. Otherwise he would be in danger of getting his feet lacerated everytime he lands after one of his long distance leaps. Zeus may have tampered with Hulk's durability as well as his HF.
3. This thread is about Zeus v HP Doomsday, and more than half of the posts are about Hulk vs Zeus. We all agree that Hulk bit off more than he could chew, when he went up against Zeus, but that is for another thread. We should get back on topic. For me, the Olympian takes the Krytonian