During early raids (say, July), both types of TMs seemed to drop more frequently than now. There was a time when they suddenly dropped less frequently, and I'm afraid that drought continues. I receive only 1 Charge TM for every 5 Tier5 raids. Less for lower Tiers, although soloing increases the odds a bit.
GamePress
Charge TM drought
I have plenty of fast TM from raids. I mostly do 5 stars raids and sometimes 4 stars.
All I got from 70 raids recently is just a few Charge TMs like 3-4. But at least 15 fast TMs.
Now I have totally no Charge TM left. But tons of shitty move sets pokemons. Like Mewtwo I caught today got 75IV and Hyperbeam move. Machamp with Heavy slam.
If in case I change to solo the tier 3 raid, will the chances getting charge TMs be better? I tried this once soloed a Machamp raid and got 2 of each TMs. I don't know if it will work again.