EA Refinement

I have been working on a EA of mine for a few months, but on some points unsure what to look for.

The EA is still pretty raw, but the backtesting results are succesful, it works on multiple timeframes and multiple currencies over a period of 10 years.

Currently I am trying to increase my profit factor to reduce risks, and am unconfident if I am doing this the right way or for the right reasons. Now I am simply trying to increase the total profits and the profit factor, but I can't increase the profit factor anymore without decreasing the total profits.
Should I continue to reduce risk even if I end up taking less profit in the long run?

The current profit factor is around 1.5, max dragdown 15%. What do you recommend me to look for or improve?

Yearly profit:
2005: 270%
2006 160%
2007 80%
2008 1600%
2009 280%
2010 400%

Do you think I should just keep testing my EA on a demo account and be patient, and leave the EA as it is?
If not, feel free to post tips.

If it isn't broke, don't fix it.

Looks like the trading system itself is probably alright, but you could always try improving the money management.

Maybe incorporate ATR into your TP/SL calculations, use anti-martingale lot progression when adding onto positions, or scale in to trades instead of sending the entire lot size all at once... stuff like that.