If you're starting in X Sector, be quick! If you get in there early enough, you can get straight on The Smiler so your original arrival time of 9am sounds like a good strategy. You'll end up in DF before the crowds and probably walk straight on to Thirteen and Rita. You could get all 3 done by 10 if the park opens early enough (not guaranteed).
I would avoid the SkyRide full stop if you're completely focused on ride time. If you're up for the walk, it's almost always quicker to walk to another area of the park than it is to walk to an SR station, queue and then ride the gondolas. If the park is really quiet, it will save your legs and maybe some time between DF and FV, but only if park is dead.