On my LA .46 I had to fully turn OUT the screw until the bleed hole was completely uncovered.

Even then the low end was far too rich, so I ended up doing as suggested, and slightly enlargening the hole.

This permitted the engine to run reliably, but the engine is still too rich in the low end.

I left it this way so as not to risk ruining the carb.

I'll bet that if you turn it out as far as you can, it will be much better.

If you do this, take out the screw and add a bit of locktight to the threads, so that you don't end up loosing the screw with engine vibration.