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@AngelD
Right, FINALLY got the new chainring today. Couldn't get size I wanted through chainreactions so ended up getting FSA ring (that actually looks quite good) else where and next time will remember not too as it took a whole week! >_<
So, new sprocket, new SS chainring, perfect chain alignment and much better tension, BUT chain tensioner still bobbing up and down like mad indicating that something weren't right with freehub. Turns out that freehub body is slightly too small, leaving the sprockets I've tried too loose and therefore slightly off center.
Packed out the HG splines with very thin card so there's no movement, and voila! Sorted.
What a bloody merry go round that was.
Took it out for first proper ride today and apart from noisy (cheap and already slightly loose) chain tensioner and too short a stem, that I'll probably replace both of soon, rides lovely.