Radec is one of my mains for FFA, I don't use the flame thrower very often because the flame thrower is slower and far more easily interruptible than neutral machine gun which is probably one of Radec's quickest attacks.
Even up close his neutral machine is usually a better option than flame thrower, the only thing is the flame thrower creates a decent knock back but it does not compensate for the slow interruptible startup frames.
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Radec's lvl is nice however it can be avoided even if locked on if the jump dodge at the right time. I usually save up for a lvl 2 and try to get 3 kills with (I play ffa) then just use my lvl 1.
Radec's lvl: best at closer range to lock on or shoot out fast if a raiden or kratos spammer
Radec's lvl 2: wait till they are about to touch the ground to catch them all
I do try to use his flamethrower, but its just so bad unless you get tons of hits in, which doesn't happen with me too often. If I ever do get close range with Radec (which pretty much is constantly since people think all Radecs are sniper spammers) I use his neutral triangle, the sniper, his sticky nade, up grab into his up circle then jump shotgun. Not a combo, just the attacks I'll use most with Radec. If I'm a little AP short of a super, I'll definitely use it to get that little AP, but other than that I don't use it much.