Stiff gears

Hi there, 2 weeks ago I had fitted one of xmans stage 1 clutches Inc dmf and a brand new sach csc. I've now managed to do 850 miles on it with mixed driving including a 330 mile round trip to Ipswich on friday/Saturday. On the end of the journey I noticed the gears were a lot harder to select, double clutching made it easier. Without the engine running and using the clutch I can select all gears perfectly. The clutch has been treated gently throughout so it's been bedded in correctly.

Any help would be great.