If you're really focusing on FS, just forget BS for that period. If you want to do both, you could do something simple like alternate FS/BS every 2 days and alternate heavy/light each day, but still get the lower intensity volume in for postural work, e.g.
day 1
FS - 70% x 3 x 5, then up to 80-90%
day 2
FS - 70% x 3 x 5
day 3
BS - 70% x 3 x 5, then up to 80-90%
day 4
BS - 70% x 3 x 5
day 5
FS - 70% x 2 x 5, then up to 80-90%
day 6
FS - 70% x 2 x 5
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