hi Freddie,
overall, i'd say your days sound pretty good. my ds started the 45-minute nap thing around 10 weeks, and it drove me batty too! :roll:
if he is indeed waking up cranky after 45 minutes, he does need to learn how to extend his naps. some babies do wake up happy and their mommies just go with it for awhile. they wake up at that point because they have finished their first sleep cycle and can't/won't transition into the next one.
pat/shh is probably the best thing to use at this age - soothing in the crib seems to keep them from being overstimulated & overstressed.
now, having said that, it did take until my ds was 16 weeks before i finally saw the fruits of my labor. coincidentally (??) he also transitioned himself to a 4-hour schedule at that time.
all things aside, most babies seem to naturally extend their naps by the 6 month mark.
hope all this waffling gave you something useful!