I personally found that doing real readingcomp passages was most helpful. There is nothing better than practicing with the real thing, and luckily there are so many tests that it's highly unlikely you'll run out anytime soon.
I've taken the LSAT twice and both times there was a LR question straight from an old readingcomp. passage. Both times that section was my ungraded LR section.
Hey nice job! My worst section is readingcomp too, and it is really hard to improve. I would recommend to just keep taking full practice tests so that way you are practicing everything.