I almost exclusively use slide to type and what I do is not think about the letters, but about the motions I would have done if I was typing with my hands on a regular keyboard, sort of letting muscle memory take over and create the correct “shape” of the word without thinking too hard about it.
FWIW I've felt my phone typing accuracy has gotten worse every single year for, whatever, almost 20 years now. That's not the case on the computer.