I got out my calipers and I figured out what the issue is.
Slingshot uses an 8 inch hole sizing, but they space there inserts
every 0.75 inch; instead of 1 inch like Liquid Force does.
Thus, when I tried bolting these bindings with a 7 inch hole pattern
to the board, the inserts are actually spaced 7.25 inches apart
(8-.75) which is why these bindings don't line up.
If I get 2009 base plates and retro
fit angle locks I would be able to solve my problem.