I decided on Saturday to spend the time to properly (well, as best I could) set my bow up (I haven't bothered with doing this up 'till now

but now my technique is coming together, watching the DVD had motivated me to, so I thought I'd give it a go).
Using the beiter limb gauges the top limb was about 3mm out of line.
I decided to try to align to the true centre of the bow (I think from the book/video that I understand what this is). Anyway, this meant that the long rod was pointing off centre (to the right - by about the width of the LR at it's tip).
I was a a bit dubious about this (I've normally focussed on having the LR dead centre).
I did think about filing the LR bush (as per the book) but then thought better of this - once done there's no way back
I practiced (blank boss and 25m) on Saturday night and the arrows were flying very nicely (I moved up to 2214's recently with big 4" shield feathers - these are nice but do punish a bad tune or heavy handed shot).
I shot a portsmouth today (friendly shoot with another club) and scored 573 with 39 10's (which given I only scored 108 for the first dozen I was very pleased with - it's an equal PB unless you go back to the early 1990's or before).
The arrows were pulling to the left for the first 2 dozen or so (I had a black hole developing 9pm in the 10/9 area).
I'm going to re-align through the LR and see what the difference is (I'll shoot on Tuesday next).
So, does tuning matter?
Of course it does (it tells your bow & arrows you care about them - in turn they'll reward you by going where you shot them

)
Simon