Flat fee Brokers offering Leverage in equity delivery cnc

I am not a full-time trader. I have other accounts for investor profile. I am looking for Flat fee broker offering following specific requirements:
1) Shares as Margin for delivery CNC
2) Leverage for delivery CNC
3) Convert intraday into CNC
4) BTST (optional)

After lots of googling. Following are the ones.
Wisdom capital
Samco {Cashplus)

Currently skimming through their reviews. All are charging 18% per annum.

Are there anyother broker? If anyone can share your experience in doing the above strategies ( brokerage, interest, other charges etc)

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