You cut throttle at 10 seconds. You should not have. And then again at 25-30 seconds. Realize that this is a friggin Spit 16. Do everything you can to stay attached to his ass, because you won't get that close again unless he makes a mistake. Even if you overcompensate and are attached too close. You'll get out of it. Stay as close as you can. The Spixteen is an unmaneuverable dung piece, don't give him the opportunity to gain separation, because he will.
Your throttle chop at 1:07 was the right move, but you should have upped it immediately once you realized he was not making that turn tight. As it was, you waited a bit before going full throttle again.
At ~1:35, are your flaps out? If not, why not? You can pop flaps at around that time (luftberry) and get the kill. Easily.
Ok just watched from ~1:35 on. It seems from your gauges that you do have your flaps out. One more notch and you'd have had them fully deployed. I'm not sure if you had stall limiter on, or what, but I know that an FM2 with full flaps deployed should have easily gotten around on a spixteen, if not with instantaneous turn, then overall.
I think the issue might have been in your decision to go luftberry and not use yoyo at all in gaining angles. From most of the time from ~1:35 towards the end, that poor spixteen is panicking. It's only when you can't nose around, and stall out, that he regains initiative. Again, I can't say why that occurred, but I know that luftberry in an FM2 against a spixteen should be no contest so it might be a stall limiter issue.