While this may not be possible in full, does anyone know of any sites where I can do just this? I'm thinking of calculation exercises that aren't just tactics puzzles, things like visualisation drills, etc.
While on the subject, those stronger than me (143 ECF, ~1750 elo) - do you find that if you do tactics for x minutes every day, you begin to fatigue after a while, and if so; do you find it beneficial to stop there or to carry on trying to break through the misvisions you have? I really need to know whether I should be absolutive in my tactical study plans when I start to do the same amount as I do positional, or to trust my intuition and say that so long as I do tactics of some form every day, I'll be ok.