I would hold on to all your equity as long as you can. If you will be launching soon then you will see what the adoption in either beta or prod will be and this will affect your valuation.
Skin in the game for your dev is great but do they want skin in the game or do they just want a salary?
As a owner you cannot be thinking you are going to get paid anytime soon as every dollar you get will go right back into the business.