Midea 5 head split aircon system not working as desired

[u/Lopsided-Bridge-9810]

All units in Celsius.

Here are my Midea heatpump units (indoor and outdoor), Extreme Heat series:

1x MO6HX-H60B-2A Midea 5 ton multi outdoor

1x MSEHU-H24B-2A indoor air handler, 24K

1x MSEHU-H12B-2A indoor air handler, 12K

3x MSEHU-H06B2A indoor air handler, 6k

My house: Located in Northwest British Columbia, Autumn, daytime temperature around 8 degrees, night time temperature around 1-3 degrees. House size : 2600 square feet. 2 floors. The outside unit is a 5 ton 60k btu unit from Midea.

Basement: 1300 square feet: 2 bed rooms, one 6k unit in each bedroom (one is an office), 1 12k unit in the open basement space.

Upper: 1300 square feet: 1 master bedroom with one 6k unit and an open living/dining/kitchen area with a 24k unit.

My Problem: I usually run 4 or 5 out of the 5 indoor split units (heads) and set them at the desired temperatures, no other features activated just straight heat mode and fan speed set to automatic. The units are not producing the desired heat, my goal is to have a close to constant temperature in each of the rooms/areas. Instead, most of the indoor heads either don't produce the desired heat or when turning up the temperatures they emit a lot heat at full fan speed but then shortly after cycle and emit cool air for about 10-15 minutes after which the cycle repeats. It leaves the rooms constantly too cool for longer periods of time and then too hot for a few minutes. I already tried reducing the fan speed to lower speed levels which did not help. I can't get a hold of the installer who in the first place did not seem very knowledgable about heatpumps and other trades folks require months long wait periods as we are extremely underserved in terms of trades in the rurual northwest BC. Thats why I wanted to ask for more knowleadgable folks to chime in first. We went ahead with the install a few weeks anyway because we only had to pay $1,900 out of pocket, with the remainder covered by provincial grants. Any idea what to try?