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VWAP prices for backtesting

My algorithm sharpe drops from 7.5 to 3.9 if I include transaction costs and slippage. Is there any way to back test with VWAP prices since contest now requires atleast 10 million capital?

Secondly, if I were to trade this outside Quantopian can I use Market On Open or Market On Close orders to avoid T costs?

Best regards,
Pravin