Racking the slid on the CZ 75 is not a problem I have noticed. I never heard of it being a problem for some to until i saw it posted on some forums. My wife who is 5 foot nothing can rack the slide on my 75.
Those triggers won't allow the mechanism to reset properly when they're installed in a DA/SA model.
I fitted a single action on my CZ 75 i use it for the range only and its a big improvement. You can set the travel and reset i have hundreds of rounds trough it no problems a DA/SA trigger with shorter travel can be bought.