Nick are you using the 1.6X corrector (barlow) that comes with WO bino's? If you are take it off and put a 2X barlow on the nose piece and see if that works. Cutting the tube is the last thing you would want to do. I use a 1.25" prisim diagonal on my WO's. Prisims have a shorter light path than mirror diagonals. Hope this helps.
Matt
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