You said snatches are fine for DUR, but then said they are MAG. In my estimation, snatches would NOT be considered a good exercise for DUR, but I am definitly no expert. Can you clear that up a bit?
Did you take a look at the strength template on Inno-Sport? It is:
Frequency (6% Drop-off):
(1) DUR An-1
(2) DUR An-2
Fatigue (12% Drop-off):
(1) MAG An-1 and/or RATE An-2
DB recommends a 4:1 or 6:2 Frequency:Fatigue structure.
Based on auto-regulation principles, you might want to structure it like this:
Day 1- DUR An-1 Upper
3- DUR An-1 Lower
5- DUR An-2 Upper
7- DUR An-2 Lower
Repeat this 3 times (so that you will have performed 6 upper and lower-body frequency workouts), then do your fatigue workouts:
Day 1- MAG An-1 Upper
3- MAG An-1 Lower
9- RATE An-2 Upper
11- RATE An-2 Lower
Days 12,13,14,15,16- Rest
After that, repeat the strength template again or move onto a different one.
In my opinion, snatches would work very well as MAG An-1 work in your frequency workout.