If you're not getting juicy brisket you're doing something wrong. Briskets have a lot of fat on them. Fat equals a lot juice. I'd be curious to know your cooking method.
I wonder if you're only cooking a flat and not a whole packer.
Sounds like a flat brisket or one that has been over trimmed by the butcher.
Remember after St. Patrick's Day…. corned beefs go on sale & make great pastrami (not the real deal but good enough).