I am using now CFS since about 12 weeks and a view weeks ago I started to change it a bit.
Aside of the below changes I posted already that I started to exchange tubes: K2+CFS modifications: The extruder and CFS tubes & connections
First, the handles to open/close the lid where going to hard and in most cases could not be opened/closed with one hand.
I printed CREALITY CFS OPEN/CLOSE SLIDE LATCH and used a bit of silicon spray (no other grease please for plastic!) like on the picture here:
Since then my lid opens easily with one hand (I always have the new/old spool in other hand 
)
I had also some spools from Eryone which have been <=196mm in diameter and which did not really work in CFS. Originally I printed these adapter rings but they were coming off too easily and I did not want to glue them on the spool. Luckily I found Creality CFS Lid Spring Clips and printed them with my last meters of HyperPLA and adaptive layer height and inserted it in slot #3:
Now I can use different smaller spools there without problems!
Let us know what you did also so far!