Seeing how Sarms take about two weeks to kick in I would lap them over and run it for just 12 weeks . Sounds kinda weird but I'd go first 4 weeks osta only then the 5th and start the lgd while taking osta for and then drop the osta at end of week 6 and do solo Lgd for a remaining 4 weeks .
So it'd be like this
Ostarine @20 mg
20/20/20/20/20/20/0/0/0/0/0/0
LGD 4-8mgs
0/0/0/0/4/5/6/7/8/8/8/8
That's what I'd do if I was in your shoes