Could anybody assist with an issue I've got on a JCB TLT 35D (2015YOM)
S/N JCBTLT35T02253047

When operating the tilt operation backwards, the complete boom will lift under pressure and then release when stop tilting. upon full backward tilt too stops there is the normal TLT kick but this issue is happening upon normal operation of the tilt system.

I have replaced few items as below:
* Main Lift Ram Upper & Lower Pins/Bushes
* Main Lift Ram Hydraulic lock off Cartridge
* Compensator Ram Upper & Lower Pins/Bushes
* Compensator Ram Reseal Kit
* Main Lift Ram Hydraulic Load Cartridge
* Hydraulic Valve block poppet valves (5 spool)
* Hydraulic Oil Filter

Items that I have tested to try narrow down the issue:
Switched hoses on valve block too try different segment
Blank off Each tilt ram too eliminate valves or tilt ram faults

If anybody is able too give any clues or ideas as too what I can check next?

Thanks All