Arm in or arm out?
Are you sure your technique is correct?
Are you shifting your hips out once you lock it in?
It doesn't take much to submit someone with a guillotine once properly applied.
Just practice your technique, dickhead.
When they have side control on you=guillotine them, when they mount you=guillotine them, even when there in north south=guillotine them. Make sure every position they get on you, just guillotine them for the tap. I mean everyone in UFC does it so it HAS to work from everywhere, ya know? Just get stronger, so you dont have to worry about anything else, as long as your guillotine is the best, you win.
Remember what they say.."If you wanna make them pay, give them one guillotine a day!"
technique > strength