First...well this is not a motor thread
...but I will answer.
33mm for a 4.5 turn is only ok with a big rotor...as it has less rpm and more torque.
For a smaller rotor I would suggest 29-31 mm with a 13mm magnet and 28-30 mm for a even smaller rotor. (magnet)
Than....the slider....turn it the other way around than in the kit. Than the steel blades show to the rear. There are marks on the steel blades. On my blades you can only see 4 marks pointing backwards. I moved the slider very far backwards...almost touching the rear t-bar pivot.
Well....to be honest...I do not know what happened to the rear axle..in the last serie of cars there is a problem. Factory is working on it.
Ah yeah...before I forget...there will be updated thick t-bar in 1-2 weeks. The thin is perfect though!