I've never really used the pinch test on my 46fx or 95ax when initially setting low speed mixture. I just let it idle for 10 seconds and then move it to full throttle quickly. If it spits or sputters, I'll lean it out a 1/12 of a turn. If it immediately dies, I'll richen it up 1/12 of a turn and try again. Once I get it to how I like it, I'll go full throttle and give it a quick pinch test to see what it does.

For my O.S. engines, I've never had luck with the #8 plug. I had to use a hotter A3 plug in the .46 and an OSF for the 95AX.