Idling Questions

I’ve been practicing idling sporadically, especially over the past month.

Last night I felt like I had another break-through, getting 40-50 full “rocks” 3 or 4 times. In the previous week I had only gotten 20-25.

I have two problems. My lower leg gets tired and I drift to the side of my upper pedal.

I haven’t tried to correct these, because I’ve been concentrating on beating my high score.

Like all things uni, I’m sure practice makes perfect, but if anyone wants to offer advice, I’m all ears.

EDIT: Sorry, I just realized I didn’t search with the keyword “drift”.
Found a good thread addressing the drifting problem: