@ZR18 I had the same issue, what I (we) failed to realize was the newer versions do not use the same quality values. if you used to use 90% with v18, then
try 70% for v19.02+, (but really try 61% and maybe 65% and see if you can even tell a difference.)
for reference 60 & 61% is like crf=20; whereas 64 & 65% are like crf=18. i never needed lower than 18 (never needed higher than 65%)
i do 65% for youtube published and 61% for youtube unpublished. (always 1440p or better for youtubes’ re-encode degrading)