Your PMI is only interested in 15℅ ($30k) of the loan and doesn't amortize, so the rate is effectively much higher. It's also on top of the initial 4.5℅, so it's always higher than it looks. I can go over the math based on your case, later, if you want, but it tends to average out to over 10℅.
Thanks for that, it makes a ton more sense all spelled out. I'll start thinking of the PMI more like a $1032 annual fee for a $30k loan until it's paid off. I'll likely target killing that debt after topping off tax advantaged accounts.
Might post this in the RE forum for more expert takes on the question, but I think the real issue here is that you only have ~$10k saved and want to buy a house, and getting to $40k is going to take you a couple of years?
No real expense or income issues, actually. It would've taken about a year from now to save up the money if we had kept our 401k, HSA, and tIRAs maxed out, with an "or two" in case life happened.
In any case, I'll consider this a lifestyle choice moreso than the best financial decision in the world. Compared to another year of shared walls, shared laundry, shared parking, no garden area, no outdoor area, no place to play my musical instruments... I'll take it.