Hey Buddy, I am feeling ya.
I have begin to have limited success with the second rune for the ignite spell. I play in 800x600 (even though I can go to 1600+ if desired) and I draw the second rune smaller than I would have thought. Long lines are more prone to be crooked. Use the same pace, Try to sqare the corners without slowing down. Make sure the make all three lines the same length, like a square without a top. Once I got get better it's about 1 in 10 or less, but far more tolerable. I am sure it will come down with time. Keep em small!
I love this game. I loved Ultima Underworld and really wanted to replay - but it is one of those cases where it is just a bit too far back to play.
I have tried every conceivable thing. I thought that because the widescreen and high resolution options were added in the latest patch (I think), I switched from 1680x1050 to 1024x768. Nope.
I changed the mouse sensitivity to NONE in the game. Nope.
I changed the mouse sensitivity to very slow in Windows. Nope.
I've tried drawing extremely slow, fast. I've lined up the cursor on a straight line in the game (Like a brick) and made it work.... very, very rarely.
I've googled every forum out there - many so dead that there are only spam posts for the past few years. Nothing.
I have found a bug. If you set a high resolution or widescreen mode, when you restart the game the overlay graphics are all HUGE and when you try to draw the runes you can barely even tell where the cursor is... doubt anyone fixes bugs anymore but it is 100% repeatable. Resetting resolution in the game corrects it.
I really, really want to play this game. There has been an RPG drought IMHO for so long. I love 1st person. I love the simple gameplay mechanics. At this point I wish I could turn on "arcade mode" for spells like the XBOX version has...