another good set for shy beaver, is a BE set along the dam with a 330. many times there is a cutout, is so use that, if not doesn't matter. I usually use a stick outside the far spring, angled back out of the water onto the dam.
another thing- is the more you are in the water moving things around, disturbing the area- the more/longer they will stay inactive. sounds like are in the water moving things every day?
if you got the time- you might pull everything, wait a week or two, come back and study the area- then set 2-3 traps at the new activity.
if you can't or don't want to wait- then do your best to check in and out and if you have multiple check days on water/conibears- use it.
and often those shy of 330s can be taken with a unlured blind set w/foothold. If you have some beaver sized traps, its another option.
good luck...trappnman