i red alot about sharpe ratio and quiet many say they dont care about it, since it penalizes "positive drawdowns" in the same way as classic drawdowns.

for example: you have a well working systems with lot of winning phases and only small drawdowns -> you get low sharp ratio. because your equity curve is not smooth.

then you can cut your profits artificially, which lowers your profit factor and overall performance BUT your sharpe ratio will be higher.

" A variation of the Sharpe ratio is the Sortino ratio, which removes the effects of upward price movements on standard deviation to measure only return against downward price volatility and uses the semivariance in the denominator."

further: did you apply oversampling and monte carlo?