Sounds still like too small of anchor. However, if you are fishing brushpiles you really should be using your Tm to hold yourself over it... it just takes practice. That is unless you plan on sitting for a long time. Then I can see why the use of the anchor as I've done it to hen fishing at night. I would go up one size of anchor... I have found that going up one more than recommended ensures a good hook.
***There has to be a fish somewhere needing to be caught!***
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