I honestly don't know much of anything about the JDM Bilsteins... or, frankly, the Pinks for the LGT. It could definitely be the struts not being damped appropriately for the springs, or it could just be that the springs aren't so hot and there's nothing the struts can really do to help.
The Tokico D Specs/HTS are HIGHLY adjustable, very high quality struts. They hold up to a lot of abuse and are very high quality. The dampening is very good. That's about all I got for ya