I'm done building the bike. I can't say if the following issue is specific to the Double Cross DC frame I received from SOMA, I weight to much, or this is a design flaw.

My seatpost keeps slipping. Per their specifications I am using a 27.2mm seatpost.

I weigh 199 Lbs. With my back pack and cloths my weight is probably 215 – 225 Lbs.

I have 2 other bikes besides this SOMA and both have their seatposts clamped to the seat tube with 5.5 Nm of torque. Absolutely no seatpost slipping, ever. The seatpost slipping is occurring at that torque value on the SOMA. I increased the torque to 6.2 NM and slipping is still occurring. I'm not sure if I can place increased force onto the seatpost or it might bend.

The SOMA only has a bolt that threads into eyelets welded to the frame vs utilizing a seatpost clamp. I'm not sure if this was a good design choice or not, I'm simply reporting this issue to the OP and the forum.