I think both WE and RJS instructions mention degassing as being important in order for the clearing agent(s) to work.
I also skip clearing agents too. Time seems to clear the wine well enough after 9-12 months. The only chemicals I use from the kit are:
k-meta
Pectin Enzyme
K-sorbate - only if backsweetening, and will skip that with dessert wines that I chaptalize to the yeast giving up stage.