I can't pick Sorin, TT and Frozen unless I use one of them.
Actually, you can only pick one Tier 1 attraction until you use all 3 of your original FP's, then if available you can select another Tier 1 FP as your 4th or 5th, etc.
So the best strategy is to get your Frozenstrom as a FP. That will always be the longest wait since it is still "new". Then do one of the others at Rope Drop. This is a tough call with your group. The Queue for TT is at least interesting and not as boring as Soarin'. However Soarin' has the multiple theaters now. I haven't been watching, but when we were there last year, I was able to snag Soarin' as a 4th FP, so we got to ride it twice. TT doesn't ever seem to be available as a 4th.
I always try to jam my FP's as early as possible so I have a fighting chance to get a 4th tier 1 FP on the day we're there. I'm even adjusting them on the fly to get them as early as possible for a chance at another tier 1.