I have a couple of road races coming up with significant amounts of gravel sections, so I have been trying to maximize the tire space in the frame. The split for one race is around 15% tame gravel/85% asphalt and 45% tame gravel / 55% asphalt for the other.
I have been looking for high volume road tyres with lower rolling resistance compared to gravel tires.

I currently have Vittoria Terreno Zero's in 32c and they are very puncture resistant but noticeably slower than a road tire (as it probably should be). Very good if there is a high risk of punctures or a need for more grip.

Schwalbe have a 34c model of their Pro One Evo TLE which I picked up. I mounted them on Light Bicycle WR45's which are 25mm internal (hooked). They measure 33,5mm.

Surprisingly there is still a bit of space. Obviously they are narrower than advertised but it probably also has to do with the lack of knobs and that the wide rim gives the tire a lower profile.
I would say if you have wide rims the bike could probably handle a 35mm WAM slick tire if you can live with minimal mud clearance. Anyone wanna sponser me some Rene Herse Bon Jon Pass  ?

I ordered from cwind. They responded to me when I asked about not offering the 7x9 clamp.

They say read the packing list not the pictures.  They say the pictures only show that 7x9 option is possible not offered.

I ordered the 7x9 clamps that look like bottle caps. They are to large and will not fit inside the seatpost. There are 7x9 clamps I think will work but will not post links for overly priced products.

For right now the frame can only do 7x7 imo.

There is no tire clearance issues for the fd.

cr060 vbr168 rf22 compared

The cr060 is more relaxed gravel position.

The rf22 has a longer top tube than the vbr168 but less setback on the seatpost.