I would push for an induction!
I was in the same position, at 36 weeks my BP went to 160/110. My OBGYN put me on the same meds you were first on and they dropped my BP to 130/90 for 2.5wks, after which I ended up being induced at 38+5 because my BP went back up to 160/110. If my OBGYN had tried another drug and let me go a bit longer I would have ended up with an emergency ceasar and possibly lost my son as his placenta had started to detach, to the point where after my 3 hour labour he bought his placenta with him when he came out.

I hope they do whats best for you!