You have a total lack of respect -- not ulcers or pain -- well, maybe pain in the a$$.
A horse should stand still whether the lead is tied, you have the lead in hand or the lead is dropped to the ground.
He needs no praise for standing for the blanket to be thrown on his back. Praise just interrupts the train of thought and respect. If he flinches or moves, throw it on 2 or 3 more times or until he drops his head and just stands there like he is bored. Same is true with the saddle.
Now, when you cinch him up, hold the lead in hand (not tied) and if his ears go back, give him one hard jerk and say "Ah!". Then start to cinch him up again. Never, never, NEVER let him bite or nip at you when you cinch him up. Either jerk the lead-rope hard or let him run his nose into a sharp nail you are holding in your hand, but bad manners that include aggression MUST HURT. When they do, they instantly go away.
The main reason most horses get cinchy or ill when they are being cinched up is because people cinch them too tightly when they first saddle a horse -- maybe recently or maybe years ago. NEVER cinch a horse up tight when you first throw on a saddle. In this horse's case, I would barely cinch it up just tight enough that it will not slip to the side should he shake. I would use a breast collar so that I could leave it even looser than I normally would until I could see if he was less apt to react to being cinched up loosley. Some horse are a lot more comfortable if they are walked a few steps and then tightened up a little more. Some horses need to be cinched up in about 3 or 4 increments before they are tightened up enough to step on them. It takes extra time and extra care if they are already cinchy.
We start all horses out -- from 2 to 22, by loosely cinching them up when we saddle them. We let them stand that way while we bridle them and then tighten them up some more. Then, we move them a few steps and tighten them all of the way up to mount. I have ridden so many colts in my lifetime, I still cannot make myself step on even an old horse without leading it off a few steps (un-tracking it) before I step on.
I have inherited many, many cinchy horses over the years. Some are really broke, but still cinchy when saddled. Some just lay back an ear, attempt to bite or just bob their heads around and threaten to bite while others set back or lay down. Some run backwards and throw themselves up-side-down or 'flip' when saddled. Some go into a bucking fit. Some just 'blow up' as a way to avoid being 'cut in two'. Almost all of them are man-made and almost all of them are from being cinched too tightly when they are first cinched up. Some are still doing it -- sometimes 15 years after they were initially broke. Some start doing it when they are 15.
An acquaintance of our does not own a horse that is not cinchy including one the flips. I finally told him one day that the only common denominator for all of his saddleing problems was him. I told him that if he was not so impatient and took an extra 2 or 3 minutes getting a horse saddled, he would not have all of them setting back or flipping. Of course he was pi$$ed. I was just tired of helping his wife get a saddle on one safely when she wanted to ride with us.