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Likewise, I couldn't work out the best position. Tried them facing up, down, fwd and finally facing the rear.

If you use good quality rings and remove and reattach the scope assembly there shouldn't be vitually any change. Probably more so on a pic rail where you can slide the scope hard fwd in its original...

I lapped my Warne QD rings for my Brno Hornet. And yes, I was aware they are sintered but for a low recoil Hornet? And once you break thru the surface when lapping you understand sintered.
Use them...