Guys, I'm struggling a bit getting my front mech to index properly. I upgraded from LX to XTR. My XTR (downpull) fits on the bb and I routed a new cable into it. I'm using an SRAM XO shifter. With the front mech fully relaxed (no tension) I routed the cable onto it, gave it a firm-ish pull to take up the slack and tightened it down. I can rotate the shifter 1-2-3-2-1 and it pulls and releases snappily enough. It'll index reasonably ok on the middle and outer chainring, but it won't drop down to 1 at all, though it tries to. I started with full-in and then out-one turn on the barrel adjuster. When I had overhauled my LX I was able to get the indexing more or less spot on. This is my first excursion into XTR territory. I reckon it's just a simple tweak with the hi/lo screws but I'm not sure which ones do which on XTR as I read somewhere that the top or botton swing whichever one it uses reverses the action of the hi/lo screws.
Can anyone advise me and steer me through the last process? Maybe XTR is intrinsically 'superior' to LX on account of the machining and accuracy where LX is perhaps more 'forgiving' in the settings?