I finally almost have my build completed,  took it out for it's maiden voyage,  but I quickly ran into a problem. The seatpost would not get tight enough. It would twist, make all kinds of creaky noises and slowly slide downwards. I applied some carbon paste hoping that would be the cure, but nope. Upon further inspection I discovered the seatpost tube is not uniformly sized all the way down. Near the top where the clamp goes is perfect, but further down it appears to get larger.  So when the seatpost clamp is tight, the seatpost can still rock back and forth around 2mm (estimating), pivoting where the clamp tightens.

 I emailed Linda at Ican bikes and told her pretty much but I just wrote above, along with detailed pics showing the measurements of my seatpost, and she told me this:
"The seatpost you need to use sizes 30.9mm . and the clamp 34.9"
 

I've been reading through this and other forums for a while now, doing research and trying to decide on a frame. But it's getting overwhelming, so I'm going to ask for some help. Lol Right now I'm riding a Niner One9rdo with xx1 drivetrain, Sram Guide Rs brakes, DT Swiss wheels and hubs. A few weeks ago I rode by buddy's Pivot Mach 6 and almost immediately decided that I need a full suspension bike. So I am looking for a frame that I can build into a Trail/All mountain rig, while using the most parts from my Niner as possible. Aside from a new/longer fork and rear shock obviously. I've been looking at the M06, Fm356, Fm058.

One problem I see is that my xx1 cranks are Bb30 and all of these frames seem to be either BSA or Bb92. Are there any frames I could use my  crankset with?