I am sorry, I thought it was the other way around. Sounds like you one of type of people I would hire in the past and most likely in a few years down the line. "We" started 18 months ago only the other way around, my best friend has more than full time job and does all the programming part time and in 40 years, I have more than one hundred concepts on how to trade futures, stocks and options. Big issue for me has been except for three people, I don't trust anyone, and all three will be involved in Hedge fund we are starting. One partner and other two later on so we can have business pay salaries/stock options. One them live in the states and other elsewhere, one will have to relocate. Although all have said I given away way too much of a business to a programmer, I trust him, and that is bottom line. But I do know I gave away 50% to someone without me has no chance of ever getting out of his profession-too late to start elsewhere, and at my age starting such an endeavor is really a gift I am giving my friend-a new start on life. He has zero experience owning a business, so I been teaching him, where he will really earn his 50% is later. I have accomplished all my financial goals, so new goals of forming businesses to employ people on tech side and others are directions we will start, I don't believe in retirement when you work at what you love.
What you up against, unless you find an very experienced trader who is tired of going at it alone(most have already programmed), what you are paying him is way too little and to be honest, no one with huge experience is going to give you much percentages even though I can see you are talented from your web pages, but I have hired guys like you for much less than being a part owner.
My best advise is contact physicians and dentist who are too getting burned out from what they do, in my experience they are very good at options. And if you still available in 2-3 years, would fly you out for interview on ground floor of new business. I think your situation best would be at beginning of a new business and getting stock options/relocation/salary/ for a quality of life company.
Good luck to you Sir.