Quasym and Concerta are Ritalan extended release. The other thing to consider is that your body is processing the stuff a lot faster. I can tell you that in my case effective time is about half the stated expected time of effectiveness no matter what the drug is. Very much not good because you end up spending twice the money. I know people who get effective Vyvanse for 12 hours and the same dose works for 6 in other folks.
Overall, I find that monitoring and tweaking meds for this stuff is non-existent and you have to do it yourself like you are doing. Good work!