ok.

run circles around him, as the combination of his 20mph top speed and 2 big vertical disks, should cause a gyroscopically induced lifting of one side of the robot. wbc2 can then tighten his turn suddenly, and get the flipper under the lifted skirt on that side. a full power flip should send the 800kg into the air fairly easily, but as he cannot self right it may be smarter opening the secondary valve only. this will give a reduced flowrate flip, which at 800kg will roll the robot over nicely (the ram still produces the full power on the secondary valve, just opens slower than with both valves)

once on his back, wbc2 drives to the other side of the arena to wait for count-out.

specific enough tactics?

failiing that, the angle of the flipper is so low, vertical disks should just skip off from the front, so a kamikazee frontal attack is not too bad, as long as it is head on, as a side hit will not be so good for wbc2. from past experience, vertical crushers slide down the flipper rather than pierce.