Hmmm, almost a blue, but not quite. If he curves back up to a higher PS I would probably be tempted to stick with this dose and see if you get better results in a cycle or two. If he does something funky like drop down to a lower PS tonight there's your breakthrough, and I would back off the dose a little bit in that case.
The good news at least is that you seem to be out of the pinks, and moving to lower yellows, and actually getting really good duration, which is a good thing. As long as you are seeing U-curves and the #s are gradually coming down like this, I would stick with a dose for around 4 cycles and then raise another 0.2 if the #s aren't mostly blues & greens. I think you will see a breakthrough soon, but hard to say for sure. When Bix was in a spot very similar, it was cycle 4 on a dose with similar results where he dropped down to a green nadir and then blue PSs after that. Of course ECID, but just so you know stuff like that can happen from here, it could all pop into place nicely (and then you may need to reduce the dose pretty fast in small increments to keep the #s where you want them).