Ahh yes!
Depending on how your spine moves, you're gonna get changes in sensation.
Completely normal!
When I lie on my back, the leads press on the spine more, so thus the need to turn down the stimulation.....

You'll get tweeked to perfection my dear!
Make sure to bring this up to your Rep at your September appointment,
Jackie....regarding the feet. He can easily tweek that outta there.
Those Reps have 1,200,231 (give or take ) different programs, and depending on how many electrodes your leads have (mine have 8 each) so with dual leads, I've got 16 electrodes to fine tune.

I'm wondering if perhaps it would 'tone down' the annoying stimulation in your feet if you turn down the pulse width/amplitute ..... I run mine as high as 45 or 50, but if I turn it way down to say 20, then i get more of a 'thumping' sensation..... I like the constant 'buzzing' moreso. But sometimes that gets annoying and I have to give it a 'rest', so i turn the unit completely OFF for awhile.....I even get a continuing 'phantom buzz' after having it on for so long.
Just play around with the different settings. That's what it's there for.....
I'm sure by now you've encountered the wonderful 'shocking' sensation by having the unit up too high and changing positions?! yes?

BTW, is yours a Medtronics? That would be me

Mark and Fiona have the Boston Sci's
Fiona just got TWINS!! Isn't that amazing!