Updated the Big Block gravel build after couple months on Sacramento's river trails:
Swapped:
SRAM PC-1 chain, 2x Roubaix 700x32 tires, Zipp Service Course 70 XPLR drop bar, Yoshida Champ Best track grips, and Specialized Power Arc Expert saddle
For:
Izumi JET BLACK chain, Panaracer Gravelking 700x32 tires w/ slick in back & SK up front (last two ivory / tan I could find online, and just bought last two ivory / black slicks at Panaracer's site...), Ritchey Classic Flat MTB bar (560MM x 5 degrees), Brooks Cambium Rubber grips and Brooks C17 Special saddle (both in "natural")
built from city-FG experience
adapted to 90% trail
Pretty pleased the bling happened to coalesce with performance characteristics I was looking for - too many changes to attribute solely to handlebar swap but I'd never rode FG on a flat bar before and it is indeed extremely satisfying