What is the correct play here?

I have been arbing between two local bookies on a market that neither pinnacle or exchanges offer trying to figure out which one has sharper lines and eventually start value betting the market on the softer one.

After 500 bets my ROI at bookie A is 5.9% while my ROI at bookie B is 4.7%. Bookie B offers higher limits than bookie A.

What is the correct play here to maximize profits? Should I just do max bets and bet value at both effectively turning part of the bet into an arb and the rest into a value bet because of higher limits at bookie B?
 
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