I finally got a proper (medium size about 13" long 8" wide and 8" high) andiron for my FB Andiamo 70 and boy oh boy what a difference it makes! I got my oven up to operating temperature (900F+ walls, 900F+ floor, 1000F+ dome) with only 4 logs (about 16-17 length) compared to a typical 6-7 with an excess amount of coals. With the andiron, it will only take 1 log to fully envelop the dome with a flame that reaches the other side of the oven.
I should have gotten this a long time ago. Previously I have been using a tiny iron grate. That has since deformed.
Weather-permitting, I'm looking forward to cooking some Neapolitan pies this weekend with this new accessory.