Agree with Tommy. The 9x5s work very nicely. Lately, I've been experimenting with the 3-blade Graupner 9x5s on an almost identical setup (4s, 900kv Tiger MTs) and really liking the performance. They're noticeably quieter and extremely vibration free.
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3 years cancer free! Woot!! ~ Cancer can kiss my grits! Ainokea! 
If you never crash, you're not having enough fun!
Pilot, Team Lavaquad
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