patricej

i have the 8900.

my free motion always stunk out loud; i never did get the hang of a hopping foot; so i started from the opposite direction when it came to adjusting to a different machine.

i found that using 60 wt polyester thread in the bobbin virtually eliminated eyelashes.
it makes up for a lot of my own "failures."
i leave the tension set to "auto".

i prefer the open toe attachment, but know what you mean about the seam humps.
i have not developed a good relationship with the flat, round foot.
sounds like it would be worth the practice, practice, practice to use it successfully.

my free motion still stinks, but at least i no longer need a gas mask. LOL