significantly?

My size 8-32 black cast frame hex screws paired with washers (because screws are too small) stick up almost a 1/4" above frame (8" full range dayton ps-220). There's six screws for this speaker. They look ok, but I was concerned about roughening up the frequency curve seeing that these protruding elements could antagonize the effects of my flush mount.

And now, after the fact, I see cheap wood screws with the plain old philips round heads are almost completely flush with the frame. I was trying to avoid
would screws due to those being prone to stripping the wood

Any advise or insight.

Should I worry about 1/4" protrusions?

Thanks.