I don't think you're "drawing fire" at all, Adair. Folks are just offering constructive advice for what they see as a problem. No harm meant!
We all know you're doing a good job.
Depending on circumstances I may stop abruptly, march up and rip out the grass then hop right back in and make the horse move again but generally speaking if he tries to graze he gets made to work so hard he doesn't have time to think about trying again. They sure can be sneaky about it though! Kody makes a conscious decision to ignore the smack of the whip until he's got a mouthful when ground-driving and that's when he gets both a sharp yank in the mouth and a sidecheck for awhile.
It may only mechanically prevent him, but on the other hand it gives him an immediate and sharp jab in the mouth far faster than I can which is a teaching aid in and of itself.
I tried to reply to this thread back when you first posted but Mom's computer ate my reply and I didn't have time to repost it so I'll try again now. In short your breeching and cart appear fine but your saddle is too far forward so there isn't enough distance between the checkhook tab and the neckstrap to let it lay right. Have you considered using something like modified quarterstraps (a strap from the breeching under the belly down to the girth) to hold the girth back until Ike loses a little weight? It might help with keeping everything spaced right.
Leia