Hey Silencer, here is a few suggestion.
Ammo Reincarnation - When mastered 30/30 (which won't take long to get lvl 30) it's abit too uber with 1 clip each 4.5 sec. I suggest around 10-20 seconds would do.
Anti-Gravity Device - Can't notice the difference with level 0 and mastered. By any chance it can reduce x2 more gravity or to make it until you feel like your floating?
Edit: Actually I feel the floating lol. (Just a bit lol)
Edit: Oh.... Now I see, if you hold you jump button you float more
Speed Boots - Well maxspeed doesn't really do anything even if you try sv_maxspeed on your server. Maybe instead you can try these. accelerate/airaccelerate/wateraccelerate
Those are pretty much it.