Hey guys, I've got some questions on 2 techniques that I've been working on recently. Will really appreciate any and all advice. 
Electric Chair
Realised that pretty often (about 50% of the time?) when I get a submission from an electric chair, it's surprisingly not because of the "splits". Instead, after I've got to the finishing position (i.e. lying on the side, gable grip right above the knee on the shoulder), a number of times, guys tell me they've tapped cuz the leg that was trapped in the lockdown was hurting. Sometimes they felt pain in the shin, other times, pain just behind the ankle.
Not that I'm complaining about the subs, but I'd like to know how the heck that happened - so I could actually add it into my game, and not just have it happen by luck.
Mini Stomp
When this move works, it's a real lifesaver, love it!
But, I'm facing a major problem - often times, my bottom shin is trapped under my opponent's leg (i.e. in quarter guard), very near his ankle (such that it's physically impossible to pull it back and place it under his thigh/shin to "push" his leg back. I'm also usually lying on my side in order to keep the quarter guard).
Any solution for this problem? Seems to happen to me really often - way too often to be normal. I'm obviously screwing something up, just not sure what it is exactly.
Thanks in advance for any tips!

Electric Chair
Realised that pretty often (about 50% of the time?) when I get a submission from an electric chair, it's surprisingly not because of the "splits". Instead, after I've got to the finishing position (i.e. lying on the side, gable grip right above the knee on the shoulder), a number of times, guys tell me they've tapped cuz the leg that was trapped in the lockdown was hurting. Sometimes they felt pain in the shin, other times, pain just behind the ankle.
Not that I'm complaining about the subs, but I'd like to know how the heck that happened - so I could actually add it into my game, and not just have it happen by luck.
Mini Stomp
When this move works, it's a real lifesaver, love it!

But, I'm facing a major problem - often times, my bottom shin is trapped under my opponent's leg (i.e. in quarter guard), very near his ankle (such that it's physically impossible to pull it back and place it under his thigh/shin to "push" his leg back. I'm also usually lying on my side in order to keep the quarter guard).
Any solution for this problem? Seems to happen to me really often - way too often to be normal. I'm obviously screwing something up, just not sure what it is exactly.
Thanks in advance for any tips!