You are better off practicing to read really dense literature if you have used up all the good MCAT verbal resources than using non-MCAT resources. Space out the good sources such as TPRH verbal workbook, EK 101, Next Step and any AAMC material(new or old) so you don't go through it too fast. You can use the mediocre prep material like Kaplan and BR verbal so you don't go through the good material too fast. While Kaplan and BR is pretty mediocre, it still helps you get your timing down and the passages themselves are often still relatively dense and written in a manner that at least decently portrays the MCAT(its the questions themselves that suck).