How are they getting out of your Guard to Mount you? I've seen people get out of Guard or Half Guard into Side Control but never Full Mount. Actually them moving thier hips forward like that seems like it would put them in a tighter choke. I mean I know you'd lose the ability to contorl them with your hips but thier torso would be like folding in half...I'm having trouble picturing this.
As to the other have you been experimenting with Arm in Guillotines?