Shifting issues. Transmission or frame/hanger?

Had my FM936 built up for a few months now, 500miles and enjoyed it for the most part aside from one, rather major grumble.

Since day one I've not been able to get the gears shifting correctly.

Transmission is 12speed XT (cassette, mech, shifter, chain, optislick inner cable that I then upgraded to the polymer, SP41 outer cable).Yes, cable routed correctly. It's always a little out and as 12speed sprockets and chains are so narrow a little out is almost intolerable. It alters during the ride, i.e 1-2-3 good a start of ride but then not good by the end (even if an easy ride so haven't hit it on a rock, etc). It alters depending on the suspension setting (have a nude shock with 3 settings). It alters during suspension compression. It's never quite right.

I wonder if the clutch on the mech is partially to blame for a number of reasons. Firstly, I know the clutch affects shifting, increasing friction at the shifter and think it alters, ever so slightly where the mech rests after a shift, which if true means that because of suspension movement and chain growth the clutch is constantly 'working' and so minutely affecting where the mech sits and given how minute adjustments affect shifting it must be having an impact.

But also wonder if the clutch is actually causing the hanger to bend - as I say when the suspension is compressing causing chain growth it's effectively pulling at the clutch, and so mech, and so mech hanger all the time - it must be having an impact - which is kind of confirmed that when I check the hanger alignment with the tool it's always ever so slight out - is it plausible? Maybe the hangers on these fm936 are a little soft?

I've serviced the clutch, and backed off the tension as much as I dare and it is better but I just dont like the fact I feel like I'm having to compromise on a nice bike!

Like the idea of 1x12 but just seems to sensitive or is it the hanger/frame? - bring back 2 x 10 I say 

Any thoughts appreciated.

Thanks for the thoughts re remote lockout or not.

Next question, SIDluxe vs Deluxe Nude.

Had a quick scan of threads page.

Like that the SIDluxe has slightly longer stroke @42.5mm, is lighter and simpler - so in theory easier to set up but that is also my concern with it - don't think you can adjust compression without a tune?

Deluxe Nude I believe is designed for Spark, so a similar bike and pretty sure it'll fit (??), has more adjustment with compression dial but is heavier and less stroke @ 40mm

Think I'm leaning towards the SIDluxe due to longer stroke, weight (getting the SL frame) and they must be confident on the factory compression setting given flagship model but don't want to get if I decide it needs a compression tune!

Again, thoughts appreciated