The race schedule I posted in March may indeed have been too ambitious, but only by one race. I ended up not doing Twin Cities this year, as I just didn't have enough time after the duathlon to get my long runs in. I'd been averaging about 10 miles for the long runs for du training (plus 16-20 miles on the bike). I wasn't able to shift from that distance to marathon distance in time. Instead, I focused on WDW Goofy training.
Training for Goofy is going fine, although I have found that I have had a nagging soreness in my psoas muscle in my left leg which sometimes makes it tougher to maintain the paces I'd been doing earlier in the year. Must be getting old ;-)