The SLX groupset is a solid group. You should have no problem with a long cage shadow+ R/D, Brake rotors are 6-bolt which hopefully match your hubs, I'd recommend the 11-36T cassette for the widest range, your choice on the chain ring option, 26/38 is common for a 2x setup but 24/38 would be useful if you do a lot of long climbs. I have no idea if the "double front derailleur option is right for an IP-057 frame.