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CTL and TSB ... need fixing in WKO+ How?

My CTL and TSS make interesting reading with CTL up to 31.6 from zero in just 3 weeks and my TSB down to a miserable -58. I think my original FTP setting of 200w was underestimated and I've lifted it to 250w since the IF for most of my rides was greater than 1, even a recent recovery ride with HR of 125-135!!

I just wish I could retrospectively change the FTP settings and get the IF and TSS re-calculated... any tips on how this can be achieved?

EDIT: Ok, so you just change the zones in the athlete settings and they get recalculated automatically. D'Oh. I could have sworn I tried this and it didn't make a difference!

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