a few things...
lgd should not be giving you a significant amount of water weight at all... more of that is diet related than anything... there is no estrogen conversion there at all...
as far as sarms keeping you dry.. yes, s4 and acp105 have on of their primary benefits as muscle hardening which of course brings on dryness as well as gw505156 and sr9009 which are both speeding metabolism and increasing endurance, both of which are used for fat loss.. s4 has always been one of my favorites stacked with lgd...