Well it looks like I will have to swap out the 10.5 and put the 17HP Intek motor I have spare onto the cat. I took it for a real workout and headed into a patch of paddock that hasn't been mown in a couple of years and while it handled two foot tall, and thick, growth with lots of small branches hiding amongst it with ease, it absolutely refused to mow the fallen three strand barbed wire fence and star pickets. Obviously needs more horsepower.
As to the ride and tyre pressures Jack, yes it is improved slightly by lowering them below manufacturers spec but any similarity between the seating type and position and ergonomic design is strictly coincidental. I fear it is the high back Cortina bucket for sure for this one.