Anyone have a fix for the 8l90 transmission shudder?

I recently purchased a 2015 Escalade ESV. I noticed it has a very pronounced shudder when shifting gears past 30 mph. Also, if I am cruising at highway speed with a light throttle to maintain speed (say around 1.6-1.9rpm) it will do a light shudder and the rpms will bounce a little. I have read a lot of forums where people discuss this issue as well as a hard shift issue from 1st to 2nd gear. My vehicle does not seem to have the hard shift issue, but it definitely likes to shudder.
Apparently I have read that at one point gm was replacing torque converters, that then they started doing fluid swaps. A lot of people seem to say that some of the earlier fluid swaps did not permanently fix the problem, but it sounds like the last one, where they swap the tranny fluid out for blue label Dexron HP LV has fixed many people’s shuddering issues.
I believe my vehicle was driven around for quite a while with the shudder and this has me worried that permanent damage has been done to the torque converter. My big question is wether or not this fluid exchange is a permanent fix or not? I have seen a lot of posts where people describe the exact same problem. I see very often people talking about this transmission fluid exchange. I never seem to be able to find follow up. Does it really cure the issue every time? Or should I expect to have to replace my tcc because it was driven with this issue for so long? Or worse? Please help I need to get this problem fixed ASAP once and for all. This is a work vehicle that I rely on to make a living.