You aren't alone, D, not in your conquesting of TA nor in your frustration about the state of it. I find myself in that state from time to time too.
I'm an almost-once-a-day person, although sometimes I miss a day and sometimes I do it more than once a day. I just did the whole island just now, clearing 116 along the way.
Side note #1
: Every time I clear TA, I also reduce all of the **0000 blocks down to **9999... as my theory continues to be that each block so prepared will absorb one whole batch of reinforcements while only adding 1 monster to TA.
Side note #2
: As I was clearing my way north along the landbridge, 6 new monsters showed up in the block directly to the south of me. This happened at 8:32am EST on my clock. Is my clock 2 minutes fast? Are reinforcements timed events?
Sandy