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I have seen membranes that got stiff after storage. Most likely they would be so in any case. I have seen more that has been stiff with fuel in them. As fuel pass thru I believe oil get stuck on the membrane surface. Run dry or not it will still be there and if oil is aggressive it will eat...

It sounds as it needs more fuel. If it responds to adjusting give it a little more on L as in adjusting needle out a bit 1/4 turn is plenty. That will give it more on Accelleration and Low rpm. If it doesn't respond/improve to this, do the same on H. They work together, H and L if H is set too...