I can only give you general advice as we've got a Mimaki here, but I've found the following helpful:
- moderate cut speed. Slower if it's high detail.
- leave any vinyl that's both printing & cutting loose (IE: NOT taped to a cardboard core) as this tends to pull registration off.
- ensure a consistently flat surface throughout and try to keep the media as straight as possible.
- space pinch rollers across the media as evenly as possible to avoid uneven feeding.