Bad time to scale the operation any bigger imo. Profits are too low unless you have near free electricity so risk vs reward is heavily tilted one way.
With the kind of money your looking to put into it on top you could get a really nice solar setup which could aleviate your electricity cost issue and increase the profitability, but you would need to get the ROI on that as well. Its one good poing is it would always have furure money saving applications.