Wow, so much information missing.
The last 71 days have been a low volatility move to the upside. How does your model perform on a down day like July 31st? How did the trades go wrong during the drawdown periods during the 71 days?
Does you model hit bids and lift offers or assume fills on bids and offers?
What are the basic performance statistics? Data like average profit per RT, number of RTs per day, holding period per RT, maximum intraday drawdown and so on.
What "CME volume bonus"? The Globex fee rebate is only for trades over monthly average 150 sides per day.
What broker commission are you assuming?
If you really believe that you will be "able run 30-50 lots with average daily $300-350 profit per lot" why do you need a partner?
What do you expect the partner to put up? Just the IOM seat or the IOM seat and the capital?
Why only 30-50 lots? Why not scalable to 250 or 500 lots? Even on today's big down day inside market on ES is 1,500 by 1,500.