Tyre size what you use? I hope that 2.1" thunderburt will fit, so i can use 395mm fork.  Maybe burt front and 50mm g-one rear.  Think that 50mm rake is better for burt.

I order both fork too.

Same gray color as C.J bike, but wiht glossy finnish.

I'm running 45mm maxxis reaver on tagoola Xplr wheels (32mm internal)
Tyres measure around 48mm width when installed

Finally managed to swap fork and test the bike also with the 420mm one
I did 600km with the 395mm fork and around 250km with the 420mm

FM316 with 395mm fork
-Ride feel is more similar to a road bike.
-Stable also downhill on gravel as you feel more "in" the bike rather than on top of it.
-Using the flip chip with 50mm rake steering feel was alright with cheaper aluminium wheels but using carbon Tagoola XPLR it's started to be a bit twitchy  on uneven gravel, I'd probably switch to 45mm rake.
I'm using a negative 6 deg 80mm stem, which can give its contribution to the steering responsiveness.
-Main drawback of this configuration for me was ground clearance, no problem on flat gravel roads but on very easy trails with rocks and roots pedal strikes are quite frequent even if I ride carefully. I had to keep in mind ground clearance also pedaling in roundabouts on tarmac where I never had problems with the road bike.
170mm 2x grx cranks.

FM326 with 420mm fork
- Front end of the bike is definitely higher, I completely slammed the stem and I'll change it to a -17deg to lower it even further.
- The steering feels much more solid and precise especially on fast but uneven gravel.
- Agility of the bike is not compromised though, the feeling of being "in" the bike vanished but the bike feels more playful overall; agility is now more a side-to-side freedom of movement rather than linked to steering responsiveness.
- I tried my idiotic roundabout test and the limit of pedal strike is definitely higher now, it makes little sense but it gives me peace of mind when pedaling mid-corner.
- Drawback of this combo is mainly related to my positioning on the bike, I really liked the 75deg seat tube angle and now I have to run my saddle all the way forward on the rail to try and replicate the same position.

All things considered I think I like the 420mm fork more because it's more versatile for the type of terrain around here and overall the bike feels more playful.
The FM316 stack and reach figures with a higher BB would be ideal.

Main drawback of the 316 is the low bottom bracket, pedalling mid corner is riskier, but you're positioned more "in the bike" rather than on top of it making it more stable.
The new diverge has the same BBdrop as the 316 so it's low but not crazy low.
Off road tracks where I live are bumpy and rocky and pedal strickes are likely, so I ordered also the longer fork, should be on its way, I'll keep you updated on the differences I experience with the fork swap.

Finally completed my bike.
Kn a very quick test on my commute the bike feels good, front it's very stable but it's still responding quite quickly to any input from the handlebar. I'm using an 80mm stem I had lying around but there's still some work to do on my fit on the bike.

I'll be testing it properly in the weekend

Looks great! Can't make it out... what color is that? (chocolate?) Hilarious amount of clearance... seems you could fit 32inch wheels w/ road tires 

It's candy red gloss trasparent paint over raw carbon.
With the awful neon light in my basement doesn't look red but outdoor with sunlight it's really nice.
I was hoping for a slighlty brighter red color but it's sleeker this way

Cane creek makes an offset spider for 110/80 bcd,
it's fpr their eewings crankset but maybe it can work also with carbon cranksets
It's expensive and only compatible with 3bolt or 8 bolt interface though

https://www.canecreek.com/products/chainring-spider?srsltid=AfmBOorUEmu96aPEvEu65FCQfKKOtg2adactGSSuZZe2Hm25SfgTaofm

The updated geometry is disconcerting.
Now the bike is 24mm longer and 10mm lower.
Seat angle is almost vertical and BB drop is huge at 84.5mm.
I hope they'll fit a 420mm fork on the bike and fix the geometry in the near future.

I can't understand why none of the carbon cranks have the possibility to fit 110/80 bcd chainrings, possibly with a different offset to have the same chainline as the GRX 2x crankset. It should be pretty easy to produce a easton to 110/80 spider but as far as I know something like this doesn't exits.