An interesting twist on an old theme. Not sure why you would want to hold on to failing trades - why not close the trade when the PSAR goes against you then double your position on the next valid PSAR signal?

If it is a succesful as you say, then this change should significantly increase % returns.

Interested to know how you arrived at:
1. 20 pip target price
2. 30 divisor
3. 65 pip stepping

Have you looked at other pairs?