Fruity is a dead host. It's programmed in Delphi. Delphi is deprecated since a long time and won't support 64 bit. To support 64 bit Fruity would have to be rewritten completely in C++. My guess is that this won't happen...
I strongly recommend to change the DAW.
The 64 bit version of Orion seems to work quite well. Reaper could also be an alternative.
Ableton seems the bee popular, but i don't know about the 64 bit support.
Logic, Sonar and Cubase seem to have some problems with the bit bridge.
Not quite correct. IL is busy trialling the new 64 bit Delphi SDK (SDK? ... think it's SDK... or is it the compiler that has to compile to 64bit... anyway, you know what I mean. They have a working 64bit build which is in Alpha ATM).
One other thing to consider Burkuagh is, unless if you're using MASSIVE sample libs (ala EW etc) and require the extra ram access that 64bit provides, there's no discernible difference in performance. The CPU load seems to not differ between using 64 bit and 32 bit plugs that are generative sythesis.
As for DAW choice... been using FL since 1.57. There is nothing that comes close to it's way of working. The Sampler channel that all samples get loaded into is light-years ahead of the game, and the workflow is completely different to every other DAW (whic could be good or bad, naturally). FL is unique in the way it manages it's lanes. No other DAW does it this way, and getting use to the 1 lane, 1 sample thing has been really hard for me... Orion.... too much of a step back. Demo X1 , Presonus Studio One and even Reaper 4 (which is quite good actually) and you'll start to notice how many little "work enhancements" FL has, that people who don't actually use FL, never realize / don't know is there. Simple example: bussing and sidechaning in other DAW are a freekin nightmare, not in FL. Pogo and sample trim in the default channel... find something like that in another DAW. You won't.
If you're serious about getting another DAW, be prepared for a bit of downtime. Demo them properly if a demo is available, and take your time. A while back I pouted about FL, and everything I did sucked, and I blamed FL for that... what a F%^&ing noob DAW. After spending ages trying to fall in love with another DAW I realized I was just in a rut and needed to freshen myself up, not my DAW. back in love with FL and churning out banging tracks, practically like never before.
Good luck mate
PS: the gist of this is, 64 bit is not the end of the world, and hardly a reason to change your known woking environment for... what plugin do you have that 64 bit only??