ds (11) was on dextrostat for years and while it helped, we had the inevitable period of time in the mornings before the meds kicked in and the big 'crash' after school (it made doing homework a nightmare). he's been on daytrana for just shy of a year-started with 10mg then increased to 15. i like it in that i can put the patch on before he wakes up so it's 'kicked in' before school starts-it also does'nt have that crashing effect (we have him take the patch off an hour or so before bedtime so he's in bed as it's wearing off).
homework is a big issue for us. on the one hand we're realy fortunate that his school does'nt believe in assigning homework just to be doing so-so there are only one or two nights per week he has actual homework, but he does have to bring home anything he has'nt finished each day (and that's at least one to two papers per nite). on the other hand my son has poor fine motor skills and he holds his pencil in the worst way-so it's uncomfortable and his hand gets easily tired. we tried to do occupational therapy much earlier in his life but he just could'nt focus or 'settle down' to accomplish much-he's now more able and we've embarked on at least strengthening his hand and arms to adapt to his pencil grasp (ot said it's probably too ingraned a habit to totaly break him of now). one thing we've done on homework is to work activily with his teacher to find out what the intent/goal of a specific assignment is-and if it's not one that is reliant on lots of writing on his part-he dictates to us (including spelling and puctuation) and we write out the actual paper. we do end up no matter what the assignment is, having him sit in the room with us so we can re-direct him when he loses focus or just chooses to goof off (we know that part of the homework issue is his adhd, but it's also the same issues of not wanting to do it and goofing off that non adhd kids of his age employ).
i'm guessing either your son is in preschool or a half day (instructional) kindergarten since they can devote a full 2 1/2 hours to a nap. that just seems overly long-and with adhd meds it can be impossible for a child to rest midday that long. with our ds it took a long time to find a good fit school wise-he ended up in a private school that while it does'nt have special services for adhd or other special needs kids did offer a classroom setting that was/is a good fit. begining in kindergarten he attended full instructional days-so no naps were required (8 am-3 pm, with half day every friday). they reccognized that younger kids don't have allot of stamina for full days of instruction so they did longer recesses than the public schools-and provided allot more of the preschool kind of art and other activities to fill out the day (but it got those kiddos used to going a full day so when 1st grade came on they were ready for it

). his classroom was/is also multiple grades-his k was k-2nd, his current is 1st-4th (different school, same system) and i think that's been a benefit because he like allot of adhd kids will hyper focus on subjects they enjoy and quickly master them-so the school permits him to work above grade level in those subjects (math and science-it seems to be the big enjoyment of adhd boys).
it's difficult is'nt it? until daytrana came along i was pulling my hair out due to the issues non effective meds were having. since your son is having lasting long enuf it may take several adjustments in the meds or trying others (i wish daytrana had worked for you, being time released it's such a godsend for these kids).