I am building up a Mach 6 (pretty much part by part). I have a 2018 frame. I am considering an MRP ribbon fork in a 170mm length. Pivot specifies 170mm is acceptable length, although 160mm is stock length fork. I am deciding between coil fork and air, And also deciding between 44mm offset or 39 mm offset. I am enquiring what those in the know might have to say about which choices would be best.