no such profitable EA would free for share, they will surely use it for private only. as commercial EA, it sound ridicilous for selling a profitable system, why dont they just use by themselves instead selling it at cheap bucks.
i'd rather to build my own ea based on my trading system. and i've been do this for past 4 years, 2 years on research try made a proper design of trading system, forward test, evalute performance, enhance.
after the logic part are done, next challenge is the EA build. it took years to made a proper code programming match my needs. and yet again, most time are spend at forward test while evaluate, add enhancement setting, another forward test.
fyi, a forward test are both done with demo and real account.
i dont have any idea what the purpose of an over backtest, to 1997 ??? dont over backtest your EA it waste of your time, better tested on real market price, tested an ea on 'dead' market price would be give you invalid result, backtest are mean only to check your ea logic run propperly or not, and got a raw set up for ea before tested in real market price.
my past months i'm on next challenge, test and research which broekrs are supported and well suit with my ea system.
my suggestion is, have a faith with your manual trading system, dont get flatter with commercial EA performance, it well build design for marketing purpose only and made by advertiser not by trader!
let me remind you all : EA, expert advisor, should be a automatic version of profitable system build based on manual trading performance, a long run research one. we can build a profitable EA only by idea and logic thinking only.
regards