If your flavors are PG and you are using 20% of the flavoring then your PG ratio is 20%.
If you are using 100mg nic juice in PG base at 6mg nic content then that would be 6% of your mix.
26% PG total in your mix.
If you try to put in 80% in your VG box it will not allow it. You would have to put in 74%.
Does that help?