AC motor soft starter

I do a lot of work for a well known fast food chain and at the start of the year they put into place a program to save money! They have employed a company to install into every store across the country "Soft start and optimizing" units to all walk in freezers and chillers.
I cover the North west of england for this company.

Since the program started we have had continous problems ie.
Coldrooms not reaching temps - disconnect these boxes and the refrigeration then works fine.

Excessive vibration and knocking from the compressors regardless of compressor type! Again, discconnect the units and the refrigeration then works fine.

Ive been in a constant battle with the company doing the work as they keep blaming the refrigeration equiment, but yet it works fine without these units fitted, so figure that out! anyway, the program has been finally put on hold by the well known fast food chain and im having yet another site meeting this week to try and sort this out....

Past site meetings found that these units should "optimize" the compressors only and this has not been the case when wired up esp on 3 phase condensing units that run condenser fans from a phase (creating a imbalance in the phases) and also units that have fan speed controllers.