Can you buy a better deal now than the one(s) that you already own? If the answer is no or maybe then there is no reason to sell. A bird in the hand is worth two in the bush
If you have a system to buy such a good deals - way to go.
Did you factor your time spent, too? Still 40% income? Sounds like a good flip
If it was just one deal - don't sell it. Find a financing for couple more and then maybe sell one.
Cash flow is more important than money sitting and waiting until you find something better.