I have seen quite a few people post here saying that drafting is very difficult (just saw another one). I have no idea whether this varies significantly between the various types of trainer but did want to pass on little suggestion, in case it helps.
First, if the person / group you are trying to draft is all over the place in terms of speed then it’s just difficult, given the lag in seeing their speed changes. But, for the most part, that’s NOT the case - most people with whom I draft tend to be reasonable consistent so that’s not a problem.
The subtle little tweak I made was this. If I am on the wheel or close to someone I am drafting, my initial reaction to them slowing down was to pretty much stop peddling to counteract their slowing down. It was a bit of a knee jerk reaction to the bike suddenly getting closer. In reality, that was overkill. Now I just reduce my cadence a little, rather than stop or slow down peddling. Generally, this means that the bike in front gets closer but then the rate of convergence slows down and we end up side-by-side or me slightly ahead. If I want to stay behind I slow down just a tad.
Unless the other person is specifically trying to drop me, I find the same when they move away. A small increase in speed normally pulls me back.
It’s a little hard to explain but my original reaction when drafting was to overdo the changes and that resulted in a “see saw” reaction between the other rider and me.
Just a thought.