[Closed] Chainring bolts for Absolute Black chainring? 4mm stainless?

I've just swapped from a RF n/w ring to an oval Absolute Black one but I can't get the bugger to stay tight (middle position SLX crank).

I was using 6.5mm bolts on the RF ring but swapped to 4mm Absolute Black bolts as advised (by AB) as the 6.5mm bolts were too long. The problem is two of them spin when only half tight, even when using a Park chainring bolt tool.

Any suggestions? I'd prefer stainless bolts and avoid spacers if poss but can't seem to find any.

(sorry for the unbelievably dull post)