Durana needs an overall higher pH than Crimson. Crimson is a good add in. Durana with proper soil conditions is hard to beat but will go dormant in a drought but long after crimson has run it's race. For a winter type trial with crimson and what else, try a pound or two of ball clover/acre in the fall seeding. You'll think you wasted money until March and then in March or April you'll think that you planted too much seed. A short term legume, a great bee plant but really seems to put a lot of N in the soil and the cows sheep will eat it to the ground even after it has matured, dropped seed and dried.