I'll just remind you the same way I remind my husband.
In some situations, being persistent and just calmly continuing to come back until you wear the horse down is the best thing, especially for a horse that isn't a fighter.
In some situations you get a tiny little bit of give today and quit on a good note and come back either later in the day or tomorrow and try for the little bit you got today and then just a tiny bit more.
You got a tiny bit of give today and you quit on a good note, that's been the most effective thing for me with a fighter. I've found that they fight and fight and fight and sometimes they start fighting a little less each day and then 3 or 4 days down the road the come back and fight with a vengeance. It seems like when they do that, all of a sudden you get a huge break through and make big strides in one day. Sometimes that's the end of the fight and sometimes you have to go through it periodically.
While laying him down and getting him to acknowledge you're on top may be your ultimate goal for now, I wouldn't even try to put him down yet. I'd work with a little trust gaining first. It might mean you have to hobble and rock for 3 hrs a day for several days, but he'll figure out you aren't really trying to hurt him and then you'll get a bit of break through. I'd make my goals much smaller and break your sessions down into smaller steps per session. Keep it fairly simple and then give him a break, even if it's just tied to a patience pole, let him eat some grass and have a drink and then come back for another session when he's fully let down from "round 1". You might do several small sessions in a day for a few days and see if that works better than one really long one.
When you say he's totally sweated, you're telling me he's totally afraid and emotional, I've found that unless I can work past that first, I won't make any training progress.
We have one right now, he's ours not an outside horse, and he's a super emotional and very chicken horse. Of course, he's the one who has a hock injury and needs doctoring every day. Naturally. Well, it's been 3 weeks now and he's no longer trying to kill us, maiming will do. We needed to trim a little of his hoof because it's gotten too long, so hubby got it trimmed and then went for another foot and did it. The horse didn't have to be tranq'd for it, so I consider that a success. He tried to go for the front feet and I stopped him and told him to accept what we'd just been given. This horse would just as soon have taken his head off 3 weeks ago, rather than let him touch his back feet. He now lets us doctor his wound and then allowed 2 feet to be trimmed. That's pretty good progress for this horse.
However, if we changed just ONE thing, he would have a complete melt down. For instance, we can hose his injury outside in the wash rack without too much fuss now, but try to scrub the wound or remove proud flesh there and it's all over but the kicking and shouting. So, we hose, then we go back to his stall. I hold his head, hubby scrubs and does the doctoring and then I give him a hand full of grain and tell him he's good. In the stall he goes to his "happy corner" and leans against the wall while hubby does his thing, doesn't even try to dance away anymore. If hubby was to hold his head and I tried to doctor, it would be back to square one. In this fella's case, he was a dummy foal and I'm not sure how much progress he's ever going to make. He may end up a pasture ornament for life.
We no longer take in outside horses and if I have one of my own that's truly aggressive and I don't feel good working with him, it's off to the vet for a one way ride. I would not accept this stallion on my property, period. Not even as a gelding, I just wouldn't do it.