I find long booms to be a real pain - I actually shortened my Penns up to 20". That way I can reach the booger ball and release easily without having to dink around with a boat hook. My boat is narrower than yours and yet I never tangle anything unless I really screw up - the ends of the 'riggers are plenty far enough apart even with 20" booms not to tangle.

Be sure to mount them an equal distance from the stern, however, as they will tangle if you have one forward of the other. If you want to run 3 or 4 of them then you will need real long booms on the side 'riggers and short one's on the stern. I have been tempted to try this, as stacking works ok for non-bottom hugging species, like sockeye, pinks, kokes, etc., but not so well for blackmouth - the bottom line will get the fish 90% of the time.