In settings, altering “max zoom” fixed it for me. Bumped it from x30 to x50 and it became readable.

I remember the mystic. As a psion fan across multiple editions, I thought the incomplete version of the first levels of mystic was neat and had some interesting ideas. Then they released the rest of the levels where it arbitrarily stopped gaining casting and I was so frustrated/vexed/disappointed/confused I homebrewed my own psion just to be able to move on.