I know rear mechs are best with the same make shifter but will a front SLX work with a X9 trigger, trouble getting the indexing to work.
Could the problem be that a tripple trigger wont work with a double front ring set up, was hoping I'd just be able to use two stops rather than all 3.
Cable pull on front mech's is the same for Sram & Shimano so shouldn't pose a problem for indexing.
A Triple shifter will work with a double ring set-up, just use the stop adjusters on the front mech to adjust to a double only set-up. Set the positions for the rings, undo the cable and ensure lower position is fine without any cable tension. If that's fine, fasten in cable, take up slack in cable with adjuster at trigger and it should index between the 2 rings no problem.
Should work on the front - I had exactly that combination on my Heckler. What is the issue with the indexing?
I've used that set up on a couple of bikes. Shouldn't be any issues. Not being rude, strip it back and start again. It'll be something stupidly simple.
1st and 2nd clicks or 2nd and 3rd or shouldn't it matter.
It doesn't matter really, but you'll probably want - 1 & 2 as per normal and you just won't use the 3rd.
Yep, just set it up as normal, and adjust the 'H' stop screw to stop the mech moving to the big ring position.