I'm not a DL expert -- but I was just there at one of the busiest times of the year (Dec. 28 - Jan2) . . . my advice would be to go immediately to Space and get a FP, then go to BTM and ride (probably a 10 minute wait), then go to Splash and ride (no wait at that time -- it's just not as popular as at WDW) -- then head back to Space, because your FP will probably be ready about then since you got it at rope drop.
What you didn't calculate was if you want to do Indiana Jones -- which is a very cool ride and gets huge lines. If you do, I would get a FP for Indy as you walk away from riding Splash back towards Space (provided your FP window has opened up, you will be able to get one then) . . . it will likely be for early afternoon or even later, but you will have ridden the three mountains and be holding a FP for Indy by 70 minutes after rope drop, which is a pretty good deal . . .