Hi,
I bought the Bernina 820 almost one year ago and have had all kinds of trouble with the BSR skipping stitches. Took it back and had a heavier duty spring placed in the BSR. This issue is also addressed on their website and there is a site your repair person can go to about this issue and how to adjust your machine.
This BSR on the 820 does not like when you use 505 for example to fuse your sandwich together. It doesn't like Heat n Bond lite when you fuse an applique and want to stitch inside the applique. I am now trying to find a product called Fuse and Fix to see if this will correct the problem.
I have taken several classes on free motion quilting and really enjoy it if the machine/BSR works properly. Don't seem to have a problem if I thread baste my quilt instead of spray baste.
Free motion quilting just takes lots and lots of practice. Don't give up-keep practicing.
Marlene
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PS: Use BSR 1 with the foot control, use 1/2 speed, single stitch plate. Hope this info. is helpful.