This is your time line and you're doing a bang up job. I pointed out earlier to another poster that any focused speculation would require decisions about the course of events after Pearl and the losses the USN suffers from those events. Given your questions, it seems that you have already made decisions regarding those events and losses.
Not decisions, more guidelines, which are slowly firming up as discussion happens here. Something VERY closely resembling the Doolittle Raid will happen. In fact, the average person probably won't spot the differences (not knowing that one of the carriers is a different ship or that its happening, say, a week later). The same situation that led to the battle of the Coral Sea will happen, and will result in a carrier battle. I'm undecided as to what ships will be sunk and damaged.
Ships will also be sunk and damaged outside major battles, though not quite on the same schedule as OTL due to butterflies. Again, I'm undecided on which ships will have different fates, though my intent is to keep things proportional to OTL for the first six months.
After Coral Sea, things get murky. The IJN will seek a battle to wipe out the USN carriers... but the USN may not be willing to grant it depending on its status. OTL's Midway, after all, only happened because the USN was willing to meet the IJN in battle at 4:3 odds in fleet carriers. Would they have been willing at 4:2 odds? I'm not sure. The Solomons campaign may not happen, and if it does will be rather different from OTL.
Eventually, the growing USN will smash the IJN either by attrition or in a decisive victory (like OTL's Midway). The Japanese will lose the war, which will end in late 1945 or sometime in 1946.
Thank you for your thoughts on USS Wasp's deployment.
I'm also going to repeat an earlier question: can anyone find a source for USS Lexington's planned movements as of August? It matters quite a bit whether she's IN Pearl or just NEAR Pearl.
Edit: found it!
http://www.ibiblio.org/pha/timeline/410813apac.html
So she would have been operating on 12/7/41.