super hard to say if it's you causing it and even if it is - such a big reaction is not deserved.
as for saddle - often what gives wither clearance will then be too narrow for the shoulder. get wider in the gullet and fit the shoulder but then hit the withers/spine. makes for a tough to fit horse.
no rush on pics just trying to help. :)
I know a few brands of saddle that have a cut back pommel, which is probably good for thoroughbreds.. He has massive shoulders to, I don't know if you can tell from the photo's, but he does. That was the first thing one person said to me a few weeks ago upon introducing mitchell to her.
I don't think i've posted this before, if I have oh well, but I walked out the night before he was taken to the neighbours, lifted up my trouser leg and said "look what you did to me mitchell, look at the size of this bruise" and he looked at it quite intently, kind of going 'what do you call that?' and he was snorting and sniffing at it and put his nose right on the bruise, it hurt haha, but i let him see it.
Then I bought a road cone over to his paddock, thinking perhaps he was bored paddocked on his own and needed a toy, when I bought it over to him he got excited (I think, he didn't look scared so must've been excited) and he started doing, in the paddock with no gear on, what he had done when I got thrown off him. He was galloping around in circles and stopping at the fence and pawing the ground and bucking and farting and rearing infront of me, I didn't know how to take that reaction, so I let him have the cone and walked out of the paddock not wanting to be in his path of destruction. He would walk over to it, snort at it and take a sniff, then go into his big bucking frenzy.. I dare say next time I take something out for him to play with I'm taking a camera.
That kind of made me think well maybe it is just the grass, afterall he's doing it with no tack on so it can't be his saddle or me this time. Maybe he's just high on grass and was a bit of a ticking time bomb.
Bubbles does the same on her "grass highs" but instead of bucking she tries her luck at a flat out bolt, but i've learnt her tricks now and can stop her cold no worries.
And by the way, I appreciate everyone trying to help, I am not ashamed to admit no I don't know a lot of things about horses, that's why I am asking questions, nobody does know every single little thing, that's why we have professionals
(even though some of them do more harm than good around here, but we won't go in to that
And I appreciate the fact that I haven't had my head ripped off for whatever reason like I've seen happens on some threads