Sorry you seem so disapointed with the Flow Mick. As I said when I reviewed the 5m Flow it is definately a beginner kite and as you say it does a good job as a 1st kite. The Flow is alot lower aspect compared to your Crossfire, the way they generate power is different so you are going to notice a huge difference when flying them side by side.
Can't really comment on the what the Standard Ozone Handles are made from (don't have any with me) but I can assure you they have stood the test of time. Ozone have been using these handles for 4+ years and I haven't known one pair to snap yet I also find them pretty comfy.
Again mate, sorry to hear that you outgrew your Flow so fast. As you have found there are definately gruntier kites out there but not everyone is confident starting out there.
Best thing to do if you have outgrown it would be to wack it in the For Sale section. Being a current model kite you will still get good money for it and shouldn't have a problem moving it. That way you can upgrade to something like a 4.9 Blade IV. If you like your Crossfire you will LOOOOOVE the Blade IV

Troy