p.s. If I'm reading the #s right (it was last night's shot that was at +16, right, so that PMPS in the 400s was a +16 not a +12 #?), her dose could be just a hair too high. Yesterday's cycle started high, then came down into the 200s mid-cycle, then into the 100s late in the cycle, with a long hang (is that the right term? I forget) at the end. Sometimes that is a sign the dose is too high, when the #s get lower late in the cycle like that.
Today's looks really nice though, I like the % drop (and this morning was a +12 shot?), so it's hard to say 100% - I wouldn't want to see the drop any steeper though [50% to 65% drop is what I've seen recommended]. I'd maybe try measuring on the low side of what you are measuring right now, or try 0.4u in the u100 syringes and see how things go with that. It does look from these latest #s like 0.6u may indeed have been too high, so that might be why you had a problem before when you tried the new syringes - if the dose is too high, they often throw out high #s to protect themselves.