http://photo.net/black-and-white-pho...g-forum/00UxmB
Efforts to improve PaRodinal included reducing suspended solids and also crystals.
IMO they are not entirely successful,the clear form in the link deposits crystals eventually,they may be sodium aminophenolate.
So well done for your work but I don't think you will get a crystal free solution.
Making it clear does not IMO affect the developing properties but it looks better.