If you are making 15%POT betting E/W , you are doing well .
I would suggest betting 1/60th of your bank E/W . E.g. $300 bank =$5 E/W run of 30 outs increasing bets by 1/60th once bank increases by 1/60th.
That way, you have a chance to survive a run of short priced paying Mules, you may have backed ,that have only placed & not won.

Try not to back your E/W selections if they are paying less $3.30 in the paper .

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Cheers.