how much do i need?

I know 9 times my Min bet for +4 is not enough. But I cannot OVER BET. i only have 25,000 in my bankroll now. I shall go back to 10 or 15 min table. But 50 dollars table got better Pen, and 2 Decks Less. I will Meet Hi-Count More often at highroller $50 table.

Questio is HOW MUCH DO I NEED for my bankroll to PLAY at $50 table for high return?

Min 50, Max 5000.
(-0.4% Game) 6D,S17,DAS, Aces Spilt once and get 1 card only, 4 tims Spilt max for other cards. Pen 85-90%

thanks