Training peaks 'form' (tsb) ... I'm really negative

Hey guys, I have been using tp for a while to basically log data. Only now have I really looked at some of the terminology of training stress etc.
One thing that has jumped out at me is (tsb). I noticed I’m -225. I’m feeling a bit fatigued but wanted to push through to taper for a 70.3 on the 8th of November. I understand you tend to perform better with a slightly positive Tsb…
I still have a few weeks until the half, is -225 a massive hole? Should I taper a bit earlier than the planned 7 days or will that be enough to shed the fatigue? I am feeling pretty crap and not training too well and have the tail end of the cold, but I’m wary of backing off this far out. Does tsb claw back into positive territory quickly or slowly?
Sorry just working all this out

**Fwiw my ctl is 493, 713 atl **

Should I cut my losses and get a few rest days in despite a taper coming up?

Your zones are not set correctly.