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left field thought here.....will a DIFFERENT scope line up correctly using the base you have on rifle??????
we use the 2nd mount Tim has shown and it works fine n dandy.

oh contray my good man its piece of piss to bore sight with a break open......even easier than with bolt all you need is a firm clamp of some sort or a box with two grooves in it,one at each...

Ive dont the reverse rings on more than one rifle with good results...nothing to loose trying it.... either switch for n aft OR turn one around the other way and see if its closer...then try same...

yip Tim beat me too it...we ended up taking smal triangle file to front of dovetail to make groove go further forward.....but sliding it to the back is best...there is a grub screw you could make...