Check out this video, my G75 keys were similar the way the key cap fits.
http://www.youtube.com/watch?v=WMrQCN_OfMk. You problem sounds similar to one that I had with my G75 in that my J key would sometimes not work I could fool with it and get it to work. I bought a
replacement key kit When I installed it what I found out that was wrong was than the upper metal tabs were bent up enough that the hinge was coming loose. I put the new hinge in after bending the tabs back down for a tight fit. Haven't had any problems since I guess that was 6 months ago or so. You have to be careful if you break off one of those metal tabs your whole keyboard is done for.
G752VY-DH72 Win 10 Pro
512 GB M.2 Samsung 960 Pro
1 TB Samsung 850 pro 2.5 format
980m GTX 4 GB
32GB DDR 4 Standard RAM
Z97 PRO WiFi I7 4790K
Windows 10 Pro
Z97 -A
Windows 10 Pro