Dressage lesson - post season tips

Get weight on Duke; increase his Senior to one scoop (currently 1/3 scoop), no more wet cob (currently 1/3 scoop), increase his Strategy to 1/2 scoop (currently 1/3 scoop).  Weight onto his back (he's a little ribby) and neck so he can turn it into muscle.
Try a new bit for dressage.  His jump bit is too strong for backing (at home), but his happy mouth dressage bit is too soft for shows.  Maybe a three jointed happy mouth with a "hanging" (?) snaffle ring?
Blanket him at night already.  He's too thin coated and is wasting calories staying warm.
We should have dropped down to Training to build confidence, but the water issue couldn't have been fixed because it doesn't exist at Training.
John says he'll work with me on how to rebalance him so he can take off from a short spot.  He says that the second run out I needed to ride him hard and perfectly, because the third one he just figured out he could get away with it.
If I do only dressage for a few months, Duke will be depressed.  He needs jumping to break up the monotony of dressage.
I'm probably riding less (and John is definitely riding him less) because of the rain and light.
John jumped him hard, so he'd be stiff, so I could ride him out of the stiffness in the lesson.
He rode great, because John's been riding him the last few days.  It was pushing his shoulders in towards John, or haunches, and then using legs at different strengths, sometimes holding, sometimes on-off, and sometimes counterbent and sometimes not.  He felt great, but it isn't something I expect I can repeat on my own.