Help repairing DC variable speed motor controller driver

[TheBigM]

I am trying to repair a board from a ball pitching machine using a single DC motor.

Here is the driver schematic that I was able to take off the board (no power or MIC control is shown and the driver itself is incomplete).

All voltages are derived from 110VAC rectification and DC/DC converters - no transformers are used; all DC voltages were and are present and operational.

The only failed components were the two driver FETs and the main power fuse (not shown).

Upon replacing them the board would power on, the LED display would show me desired output speed, turning the knot controlling would increase the number on the display, i.e. it looks like it's working.

However the output voltage would vary wildly. I do not have a motor on site at the moment, so I was wondering if the circuit may need inductive load to work properly.

Attaching active load makes no difference.

I naturally replaced the FAN driver itself as well as the current sensor - no change in output.

There is no damage in the gate circuits that I can tell and am used to repairing power supplies, so I can usually tell.

Any ideas on what I might be missing?

Few things that bug me:

1. Why use different value gate resistors for the MOSFETs? I've never seen that and I am certain it is OEM, the board has not been worked on before.
   
   
2. Why use the switching relay at all if all NC, NO and COM contacts are shorted on the PCB? Again, it's OEM. If it was used as a cheap coil only then what the heck is the role of the coil in that circuit as I can't figure it out.
   
   
3. What is the role of the coupled inductor? Is it sensing or is it used to control the output? One of the two back to back diodes there might be a zener.

Note the schematic diagram is incomplete. All power and MIC sections are omitted (since power is present and the MIC appears operational) and there's more after the J? pin marked as input on my schematic.

Thank you!