Hi Nadja,
I would hold the dose for another day. If there's any way you can get a +6 during either cycle, it would help evaluate how low Sam is going, and if the numbers you are getting preshot are because of not enough insulin, or they are bounces from too much.
I agree, the numbers need to come down, but if the dose is too high, the bounces won't allow the lower numbers to show up at PS time.
What Robin said about lowering to .5 may be the way to go. The blues from the 4th might be causing the higher numbers since.
Carl