I recently bought a new frame for my girlfriend which meant the front derailleur from her old bike didnt fit on the new frame. I got another FD from a friend that fitted the frame. It is a shimano deore (dual pull). I have connected the cable from the top of the FD and adjusted it, but it is INCREDABLY hard to shift from the smaller to a bigger chain ring. The shifters are SRAM X7 and when they were on her previous frame with a Sram X7 FD they worked fine.

Does anyone have any suggestions on how to solve my problem?