Try the SV or MV kernels, my first Droid was wonderful using uLV or LV, but my new Droid doesn't seem to like those lower voltage kernels.... but once I went to Chevy's 1.0 GHz MV kernel my phone not only runs much smoother, faster, but cooler as well... go fgure eh??... only my battery life lost about 10% in a day.... but still can have a full day's worth of heavy browser, GPS, & music usage ans still end up with 40%-20% by the end of the night.
I had the same behavior before using medium voltage kernels. Now I can go up to 1.2 without reboots. Only once, i had my droid on the car dock, with the sun, gps'ing, and it fc. So i added a profile to scale down the clock triggered by the temperature and everything works well now.