Vocab Cards: Difficulties Printing Words Lists with Avery Business Cards

Hello,
Here is an issue I ran into. Perhaps one of you have has found a solution.
In the Words list option you can select 3 Cards, 8 Cards, and 10 Cards. The screen will then list the compatible Avery products if you want to print those options. I ran into an issue when you try to Print/Export the cards on the Avery stock. All of the Avery options for 10 Cards use a margin of .5"x.75". However, Logos 6 only allows 1x1, .5x.5, 1x.75, 1x2. Based on which margin option you use, it will resize the note cards. Since there is not a compatible Logos preset margin with Avery margins your note cards end up misaligned or the edges are chopped off. Which can be an expense mistake.
Does anyone know of a way to create custom Logos margins for printing and exporting?
I tried going another route by exporting the word list to excel and then doing a mail merge. The issue here that arises is that Microsoft word does not have an easy option for creating a label that is intended to be double sided. If you do it manually from an excel file by
1) creating a label merge for the front
2) print the cards
3) Create a label merge for the back
4) Print on the back side of the cards
==> it doesn't properly match the vocab word on the front with the gloss on the back.
Not a fun mistake when you are learning a foreign language and don't catch it right away To create the back of the vocab cards correctly takes some kludge tricks in excel.
Any suggestions for a more efficient ways to do this?
Ultimately I think it would be best if you could select an Avery style in Logos when you are printing. But I expect this would have some complicated licensing with Avery. Probably the easiest way would be to have a custom margin options for the note cards.
Grace to you
Eric