The bedding block in the tikka does not seem to work like a conventional system. I have heard of a few tikka that people bedded, with and without pillars, and lost the consistency and accuracy they had.
Its funny the most common advice on bedding most rifles is to tape the bottom of the lug so it is not compressed in the stock but the tikka almost seems to need that compression for consistency. Im not sure how you checked the fit with a compressible spacer but I would lean towards the block not fitting into the action properly.
I know its tempting to play with a shooter to get it even better but so far I have resisted efforts to screw with my T3s, a .223 and a .270 that are out of the box screamers.
Hunt hard, kill clean, waste nothing and offer no apologies.
"In rifle work, group size is of some interest...but it is well to remember that a rifleman does not shoot groups, he shoots shots." Jeff Cooper
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