You'll find LOTS of reference to 20-Hydroxyecdysterone (20E/20H) in the literature. Just my $.02, but for me I consider 20-H far from the ideal. However, this doesn't mean 20-H isn't good for everyone.
With respect to "crystallization", it's true organic compounds will crystallize easier the purer they are. This has nothing to do with bio-availability though. The vast majority of Ecdysterones are water soluble and thus have high oral bio-availability due to their multiple OH groups(1)..
(1) E. Saez, M. C. Nelson, B. Eshelman, E. Banayo, A. Koder, G. J. Cho & R. M. Evans (2000). "Identification of ligands and coligands for the ecdysone-regulated gene switch". Proceedings of the National Academy of Science 97 (26): 14512–14517. doi:10.1073/pnas.260499497. PMC 18950. PMID 11114195.
Rubrosterone is the exception here. See below comparison to 20-H. You'll notice Rubrosterone has but one OH group, and is missing the classic "tail" associated with most Ecdysterones
Rubrosterone
20-Hydroxyecdysterone
Synthagen contains liberal amounts of 20-H, but is also rigorously tested to include a unique grouping of ecdysterones collectively known as the "levseins complex", as cited in the former Soviet literature.
I-force should be commended though, on going the extra mile for 99% material. I'm just happy it works for YOU! 