Well I guess I’ll just use this as a training plan before/after performance test.
I know he uses it as a ceiling for where zone 3 ends not that I was amped up to exceed that power anyway. 
I don’t really care about W prime and won’t use it. That was just an after the fact observation.
I think endurance training is supposed to around 50%, 6 minute power, but I’ll be going off RPE.
Dave
Yes, we are merging conversations here… 6’ is very strong indicator of Vo2max and a very reasonable effort to base the rest of your training off of. I much prefer a 6’ to a 20’ 6’ is actually very similar to a ramp test as you also have about 6’ above FTP in most cases.
I don’t know why I feel this way but my guess is in your case your CP is a bit higher than 170 and W’ a bit lower that 22kj maybe 180/20 but that is completely a guess. I don’t think you do TT races so you are not likely to get a perfect eFTP calculation and eFTP is not equal to CP when you get into the math but none of this really matters and is splitting hairs. RPE is an excellent choice