That is a nice PMPS there.
I'm not one to advocate a decrease without seeing the signals.
It looks to me like Harley just cleared the bounce today, not that the 3.5u hammered him down.
He needs to hang out in the blues and greens if he is ever going to get used to them
It's difficult for me to say at this point whether 3.5u is too much or if you should go with 3.25u, 3.5uS, 3.25uF. . .
you haven't held a dose for more than 2 cycles in the last 4.
If you are concerned about not being around to monitor and Harley going low, how about trying a fat 3.25 - and holding it?
Lantus likes consistency - you need to find a dose you can shoot consistently every 12 hours.
that's my $0.02. hopefully others will chime in