That carby has been rebuilt twice since it went on. First timewhen I first had the carby putting it on, and then again by a carby 'expert' in Knox. Also checked over by a carby expert in Bayswater and given the 'ok'. First guy got the air con assist jet stuck on all the time so it ran rich all the time. Was never really happy with it and got sick of spending money on it.
Never really seemed to have an issue with angle, maybe clogged up with dirt? Have you also checked the fuel filter near the fuel pump, and also the tiny filter in the pump? Might need a new filter and a clean.
You should have the stock carby in the pile of bits. Suggest you have a go at rebuilding that and putting it back on. Should make it more driveable as it has a bit more low down torque than the webber, but I think the larger and heavier tyres I had on it sucked up some of the power and drivability. 31s, stock carby and extractors and the thing was a rocket..... which might not be a good thing

Manual choke was the only drawback of the stock carby. Auto choke on the webber was much easier.
Regards,
[email protected]