I have a Cannondale XL Prophet and currently run 3x9 setup with SLX triple crank, and currently running E type Shimano XT front derailleur M770. I am thinking about dropping the big ring and running E type Shimano SLX M665 for 2x9 set up if it gives more clearance?

I have heard SLX E-type front derailleur is a little more compact than XT and I have also heard they use the same cage and are same size?????

Prophet is getting 650b front and rear. I heard some clearance issues with rear tire and front derailleur if run in FR setting.

I will be running Neo Moto 2.3 650b rear.