Is there any way to make this more strict. Quite often it accepts strokes which are completely different and seems to be less strict on stroke order, which I have set to 100% (not sure if this applies if using raw squigs as well). I have to say I feel I'm learning better with this setting, even if it was a little depressing to begin with.

No, we can't make it more strict. Sometimes you get that unfortunate phenomenon where you try to write one stroke, but it's wrong, yet gets recognized as another, but you don't realize because raw squigs are on and it's not showing you what stroke your squig was recognized as. Sometimes frustrating, but you kind of need the hintlessness in other situations for raw squigs to be hard enough.