Your trainer and I have very fundamentally different methods, it seems. As Kayty said, constantly bumping, squeezing, kicking is going to teach Cinny to totally ignore your leg. You need to teach Cinny to respect your leg and respond to the slightest squeeze.
How do you do that? Not with spurs. You need to have a very educated leg that can keep a spur from hitting the horse unless it is needed. I suspect your trainer having you "bump" the horse has made your leg untrustworthy for now.
I would get the dressage whip and rub it all over Cinny. Make the whip feel good and rub his favorite places. He needs to learn the whip is not the enemy. Then, when you ride, you ask Cinny to go forward. If he does, you verbally praise him. If he holds back, you give him a second chance by squeezing a bit harder. No kicking. Kicks are for the bigger problems, IMO. If Cinny does not react to the harder squeeze, give him one light tap behind your leg on his haunch. Then, when he reacts, verbally praise him, so he knows he did well.
It will take very little time for him to learn what is expected. It will take longer if you don't use your voice to let him know that he did well.