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I have the same issue with spinning at the end of intervals, prob not ideal, but I just slow my cadence right down in the last few sec.
You could try out the ramp test and see how it compares in terms of ftp. You can do it in erg mode and Trainerroad are going to start using it as their standard ftp testing protocol soon.
I really struggle to get my power/cadence right on 8 min tests as I run a 1x11 setup with a 56T front ring. I've embraced the ramp test because of that.
Sounds about right, I'll give it a go later, CBA doing another FTP test though. Cheers