If I had to give up one park it would be DHS. No question. However, there are a few (ok, 3) reasons for me to go to DHS (Star Tours, RNR, & TSM).
My personal plan of "attack" so I wouldn't have to give up what I want to do would be to do IOA one day. If you love HP and must see it and want to go on other thrill rides, then go for it.
I would then consolidate DHS and AK into one day when DHS has eEMH. AK in the morning, be there at rope drop and have fun. Then take a little break and go to DHS for the rest of the evening. This would only really work during slower part of the year, such as the next few weeks. The end of September is a great time to go, btw.
Have fun and I hope you and your party makes the plan that works best for ya'll.