1.5 years is not that long to save to buy your second rental. The first few acquisitoins are usually the slowest for most landlord investors. Then it starts snowballing from there. This is what I have learned from speaking with several local investors - and some on BP.
Anyway, do whatever makes you comfortable. I personally don't see the point in reviving debt on a free and clear asset, but have no qualms generating new debt on new assets. I guess it's just psychological/emotional if not logical. As the saying goes, "Its better to have a bird in hand than two in the bush."
It doesn't sound like your property would perform well with enough debt against it to really help your future investments. Plus you need to consider that banks will see that debt and count it against your debt to income ratio when determining if they will grant you a new mortgage. If you are having a hard time paying off CC's and saving money, then my guess is that your DTI ratio might be a little tight. Plus you will need to season that money you pull out for at least 6 months so a new mortgage banker does not see it as borrowed funds being used for a DP which most prohibit.
So, look at the functional analysis as well as the numerical analysis before doing anything. Have a clear and complete plan of what you will do with that money before you borrow it and only then can you do a functional analysis.