HAHAHAHA Love the formula!
Dude. Im also dating at least 3 girls each week. Haven't closed any of them though, but i get you when you say, How can someone manage being in so many relationships with so many different girls?
I try to be honest about it, If I can't manage to spend more time/money on a girl, i just cut contact for a period of time. You need to do the same. Else your wallet will run empty, you wont have enough time for yourself, and eventually one of those girls will turn emotional on you and want to have you as her BF....
Don't try to handle more than you can, and do not waste your time and waste other ppls time dude!... Its ok to "game" but jeez, give it a rest
Stress out and date only those that you care the most for.
Im not saying you sould dump the others, but try taking a rest from that 7 girl repertoire.