Looking at the wear on the outer edge of the rear roller I'm wondering if you have failed bearings?
Bit unusual for rear roller bearings to go because they only turn slowly it's the other 4 bearings that go first because they turn at engine speed.
When I replaced mine I used about 50% less fuel, that's how bad they were.:-)
Not sure about the housing bottoming out, is your grass thatched? maybe it needs scarified.
When I press the clutch handle she goes forward but I have overhauled the clutch, new lining and ring gear
Have you got drive or is it slipping, not sure from your post
