When I traded prop I also did large volume. However I had the firm which use to be BSI ran by Angelo set up flat rates. I was paying $30 per trade round trip, plus software fees. That worked out a lot better, because like yourself I would buy 7K lots at a time and trail after .05. Set a realistic goal with $60 in BP set a daily goal between $200-250. Which should bring you in the neighborhood of $48K - $52K annually. Of course the preceding applies to intra-day trading on Margin.
There is no "standard" rate with prop firms, it depends on what you negotiate. Like others have posted, definitely go with a registered firm, whether it's WTS/JC or any other legit firm mentioned on these boards.
I'm 3 years into trading and only a CPT for past 4 months. I blew up big before I figured out risk management is rule #1, #2 and #3. I am also new to the board and may not be getting the full picture. But it looks like everyone is trading big volume against algos and hfts. WHY? I am very confused? Why trade 100k+ shares trying to scalp pennies against the HFTs while letting the firms take all your profits thru numerous volume fees? Today I game-planned for 12 equities. Two of them hit...TSLA and IBB. I did 5 option roundtrips and 4 equity RTs at 100 shares each and grossed $1953. Please know that I am not being critical......I am relatively new and trying to figure it out.