I would stick it out a bit and possibly go lower. The 250's and 260's PS's aren't bad, but I see what you're seeing in the flattish stuff. For Ari, when we see flat's I try and see if we had any super low numbers on the same dose right before and if so, lower the dose. ECID, but for her, when she flattens on a dose after hitting really low numbers, it usually means it's too high a dose. Your nadir's look like they are coming later so you're shooting on the upswing, but your current dose may still be in effect. If possible, can you catch a +1 or +2 test? For us, if her +1 was lower than PS, then the previous dose (the one BEFORE the shot that happened an hour before) was still working which usually (for us) means that it's too much.
Did any of that make sense? We ended up with a lot of elevated numbers during our dose reduction phase as her body fought against the doses and overlap that was too high. If you look at her TID sheet (which is no longer TID, she's back to BID) on line 73 you can see that we hit 40 which led to a really high following PS. I lowered the dose because of the 40, but checked at +1 and it was already going down which showed that indeed the shot 13 hours before had been too much. It usually takes her at least 1 or 2 cycles to shake the crazy numbers of her body reacting.