Ive been rolling regularly with this new guy at the gym; 90kg purple belt Russian wrestler; so i get into mission control often,clear the neck and get him in invisible collar for a while; once i try to go to Gogo clinch or hazelets he just tucks his shoulders and chin and i always find myself forced to go to Jiu Claw as a last resort; i know the Omoplata does not have a crazy high success rate and needs time to master; but wondering if anyone has any tips on controlling bigger guys and finishing on them.