Problems making effective use of Rear Mount w/ Hooks or Body Triangle
Maybe this sounds ridiculous to some of you, but it's a problem I've been having, albeit only with a few folks, one fellow in particular.
Basically, I've been working on my movement/sprawl and w/e and it's becoming pretty decent, although still decidedly sub-par. Anyway, I've been finding myself holding guys in side-mount less often than I used to as more advanced, but somewhat smaller guys are giving me their back and turtling, rather than trying to get the better of the take-down or escaping to guard. Now, at first, I was having trouble getting anything meaningful from them turtling, but I've improved that and can get hooks and body triangle pretty easy now.
And here we get to the root of the problem.
Attacking the neck. Let's take tonite for instance. Very tough training partner who I roll with often, maybe 20-30 lbs smaller, with a good sized neck. I got the body triangle TIGHT, he's not going anywhere. I attacked the neck, but him shrugging and lowering his chin made it a useless waste of energy and I was sore to begin with. He locks his arms together to defend as well. I try looping under pulling somewhat of a nelson to open for the choke and get some ok attempts, but I didn't have the leverage and couldn't muscle it. We rolled for a good half hour and I had a solid back mount for quite awhile a couple times, but just couldn't capitalize on it and it was frustrating. He escaped the first time by giving me his arm and I knew it, but wasn't going to just keep camping on his back like a jackass and went for it. The other time I went into mount. So I can hold the position well, just can't get the tap.
Any thoughts from the more experienced grapplers out there?
Thanks in advance.