I use the racks whenever I can, since I don't really let games sit in the cabs for more than a day or two, generally. They are sized well enough to hold most modern pcbs, older stuff is usually too big. You can steal an extra 0.5"/1cm or so by cutting the tracked section and mounting that as high as you can on your mounting board, making sure it can still slide into the metal guides/slots/sluts of your cab. That extra c-hair of vertical size actually makes a big difference with some pcbs.
And because Im a BygTymer(sic) I keep one in the cab, and two on the wall nearby so when mashing with pals we can get a queue going and not have to fuss around with unboxing and chucking bubble wrap around.
EDIT:
It seems this was actually about PCB feet.....
I dont know what to tell you K2 pal..... Maybe.... Just buy more pcbs until you win the pcb feet lottery.
I worked for me, could happen to you.
xGiefx