I have an issue with fitting a front mech on my mtb frame. I have a 50 40 30 chainring setup on race face mtb cranks for road use but I have had to stand off the drive crank by 5mm to clear the frame.
A shimano road triple mech only moves 12mm outward and cannot reach the outer ring. A shimano Mtb triple mech moves 17mm and can reach but the chain doesn't line up with the grooves on the inner plate and it gets jammed.
Ideally I need a mtb mech with a road cage. I have a 9spd setup on sl-r660 shifters

I have considered the SRAM 3.0 but it says its for 7/8 spd setups, would this make any difference?

Does anyone have any ideas?

Thanks

Justin