LGD-4033 is undoubtedly powerful for lean mass, but we need to talk about the dose-response curve here.
Most of the clinical data on Ligandrol (LGD) shows significant results at just 1mg to 5mg. Moving to 20mg daily isn't just a linear increase in gains; it’s a massive increase in SHBG (Sex Hormone Binding Globulin) crushing and systemic suppression. By week 4 or 5 of a 12-week run at 20mg, your natural testosterone levels will likely be at floor levels. If you aren't running a 'Test base' (like 150-200mg of Test E) or at least a SERM (like Enclomiphene) alongside it, you are going to hit a wall of lethargy and zero libido before the cycle even ends.
Regarding the S4 (Andarine) at 50mg: It’s a great addition for hardness due to its high affinity for the androgen receptor, but remember the 'yellow tint' vision side effect is dose-dependent and usually kicks in around that 50mg mark. If you notice your night vision failing, you'll need to follow a '5 days on / 2 days off' protocol to clear the metabolites from the ocular receptors.
My suggestion for a cleaner 'dry' gain without the fat:
Instead of just stacking more orals, prioritize your glucose sensitivity. At 180lbs, LGD can make you hold significant intracellular water (the 'LGD bloat'). Dropping the LGD to 10mg and focusing on the S4 and maybe some Cardarine (GW) for nutrient partitioning will give you a much more aesthetic, 'keepable' look post-cycle.
Don't underestimate the suppression of a 12-week SARM-only run. Have your PCT (Nolva/Clomid) ready before you take the first dose.