We have a BUNN coffee maker that we like.  But, the grounds go over the top of the filter sometimes.  If I use 4 Tbls it's not bad but 5 or heaping the 4 puts grounds over the top of the filter.

BUNN sent me a new dispenser to replace the original and it worked much better but still have the same problem, just not as much.

I've looked for tall filters but haven't been successful.  One place said they had tall filters that were 2.75", but measuring the BUNN ones I have that's what they measure.

I think 3" would be sufficient.  Just that quarter of an inch would make the difference.