If I ignore some of your calculations that make me twitch, the simple math says going from -25/mo to 150/mo (so a switch of 175/mo) is 2100 annually, out of 25k invested = 8.4% return. Most would be pretty happy with that.
I'd probably be looking to sell the property, personally, and if you really want a rental put the 25k down on a new property that is better than $925 rent for 100k, but that's a decision that needs more information (location, goals, etc.).