Heat Pump heat exchangers

Greetings,

So i've got this air-to-water heat pump of 160 kW that worked fine in cooling mode, now that it's needed to work in heating mode we get an issue... the high pressure reaches the 30 Bar in like 2 minutes of working, now we are not sure if it's from the metring device or the miss-sized condenser / evaporator.

The air condenser internal volume is 42 litres.
The shell and tube internal volume is 11 litres.

We though about eliminating one or two air condensers in heating mode, to create a balance between the two exchangers.

I would like to get some of your ideas to solve this issue.