...the USN calls 2. Ben Blee called 3 and when I spoke with him he explicitly stated he relied on Sherman's personal assessment of 3 but I believe the (IIRC) bomb elevator explosion was confused with a further torpedo hit, as I believe the War Loss Report stated.
For me, also, the time interval between the last detonation and the previous known hits is not consistent with the torpedo salvo but that's surely more subjective. Included in all the Wasp documentation I have--and I have practically everything but the Shafroth Report, tho' that's coming--there were few witnesses of the many who claimed to see or judge 3 hits although Durr was one of them and he definitely called out the 2 which definitely hit...Durr being the fellow who pointed to the rising torpedoes and exclaimed something like, 'Those have got us.'
But consider as well the fact that fire destroyed Wasp, not flood. Frankly, I'm not of the opinion she would have remained afloat or that her condition would have appeared--other than the fire--to her screen as it did had she been initially hit by 3 torpedoes. Incidentally, Lansdowne scuttled her with 5 torpedoes but only 3 detonations and watched her go down.
This is all off the cuff, long-winded and subject to later massaging but I believe the answer to your question is 2 IJN hits followed by 3 USN hits.