What is the NLGI rating of the CV grease you use? 1 or maybe 1.5?
NLGI 1 - CV joint grease?
NLGI 0 - corn head grease
NLGI 00 - steering box grease
00 grease is self-levelling
0 grease might level-out
1 grease does not level out
https://en.wikipedia.org/wiki/NLGI_consistency_number