I use 20% so with 30% you might be better off with the 14x4.I guess the tach will tell.Your hardware sounds great.As far as spinners go check out Tru Turn.They have a new line of small ultimate style with the wide blade cut.A bit more $ but they are really nice spinners.Mine has held up just fine-Like all good 3D planes keep the throttle down unless the nose is up.This little bird just loves to fly slow.I fly 40% most of the time but this plane has me loving the small stuff again.