Thank everyone! My body is being a weirdo, I'm not sure what the deal is.
With both weights and cardio, I can go up or down around 30 points by the end of the workout, but 15 minutes after that, I'm always back to within 5-10 points of where I started without treating or correcting. I've never had the delayed low either.
Last night, I gave a modest correction that would normally bring me down 30-40 points and hour before going to the gym. I was 212 at home, 190 when I started my routine. I took it pretty easy, tested throughout, and my lowest number was 113, right at the end.
I thought that was great, finally I'm back in a more normal zone. By the time I got home, 15 min later, I'd jumped up to 227 and felt crappy. I didn't eat anything, nor was the drive home stressful in any way. I don't get it.
I've switched pods, insulin, and even tried correcting with a pen. It seems like I'm becoming more insulin resistant, even though I've reduced my carbs to around 50g a day, and have been exercising daily.
Today has been better, I've stayed between 110-170 all day, but am using twice the insulin I did last week, and last week I had great numbers!