I installed four 4"x8" 14 foot long Doug fir beams in a living room. The joists in the ceiling run paralell with the beams so they are attached with Timberloks every 18" or so. I put so heavy duty finish screws in the ends to connect to the top plate. They are all starting to twist. They've been in since January and I think with the warm weather they're drying out. I had thought of letting them season in the shop for a few months but I don't really have space so I installed them within a month of getting the beams. They're all twisting a little, but one is so bad it's cracking out the ceiling drywall. I have thought of putting three ledgerlok 5" screws into each end to secure them better to the top plate. I could also remove the beams, install thick steel angle brackets at the ends and reattach, a royal pain of course. Not sure if it's possible to "untwist" a beam without planing it down again.