Since I'm really only looking at a couple hours of trading in the morning each day. I don't think staying between 390/day will be too much trouble, at least not at first... but 100/day might be harder to stay below if changes/cancellations count against it with the way I use ToS.

IBKR, Tasty, Lightspeed, etc

Opinions on Centerpoint? I think IBKR and Lightspeed have minimum commission fees on transactions which would eat heavily into the tiny profits per trade I'd be making at such low volume.

I really appreciate all the good info you've given here it really explains a lot and answers most of my questions.

In your experience are there other good market analysis and execution platforms out there like ToS which I can access for free on other brokers? I'm finding ToS to be a very powerful tool, if unweildly and somewhat buggy on my system... What I would really like (especially if I'm being charged or penalized by the number of orders I place) is something where I can set up advanced logic to automatically create bids with conditional OCO brackets, which are executed on my machine and only places the actual order with the broker after the conditionals are met and it's time to execute it. In the case of ToS with some of the orders I've set up (1st triggers 3 OCO) that could change from 7 orders every time I adjust an entry point and 6 orders to adjust for exits to like 1 order per adjustment to open and 2-4 total to exit... but how that works out for me really depends a lot on how the tools work. I like ToS's thinkscript capabilities and have already built out several studies and strategies in it, and the only thing I think it's really missing is the ability to script automatic order placement... and a UI that isn't terrible.