When are you going? My only advise is to remember that in the hotter seasons AK is HOT and racing around trying to do stuff in a short amount of time makes it even hotter. And if you go straight to DHS, you can be very worn down from that heat.
We just did what you are doing and have vowed never again At least full days in each park or rope drop at AK, leave after lunch and then HS after a break.
But with that said, we got to AK just after opening went straight to EE, Kali, the Safari, walked down the trail to see the gorillas and rode Dinosaur last. We ate lunch and left at 2.
DHS is where we used FP for RnRC, Star Tours and ToT. And it worked well.
I do agree with the pp that to really do AK justice it takes all day. I missed the taking it slow and seeing all the animals.