The problem of confused fingers you mention is not necessarily caused by poor reading, if you can successfully identify the pattern as triple double triple when you see it your reading is fine. It's more likely caused by poor muscle memory, and that's something you can only fix with practice.
As for training reading in general, what you need to do is train on maps that are either at the AR you wish to play or are at an AR that is in the direction of the AR you wish to play but is just outside your range of comfort and that have pattern complexity that is just outside your range of comfort at that AR (if you're playing at a higher AR than you're used to you'll likely want to shoot for patterns that are slightly less complex than what you're comfortable with). As long as all the other difficulty attributes of the map (aim, accuracy, speed, etc.) are appropriate you should see regular improvement.
Do not give in to the mindset that the best option is to train at ARs lower than your norm. Many will recommend it, but that recommendation stems from a misguided understanding of skill development, and while it will work eventually, it will not be as efficient as conventional training. It's worth noting, however, that if what you think is your appropriate AR is actually too fast you will need to step down to an AR that is actually appropriate for your reading skill. Naturally, the onus is on you to make that call.