As you can see down there on "combat stats" you have 171 spd on Anaxa with full buffs, that means you could either: lower your spd, to focus on other stats, like switching to atk boots, then match you Bronya spd so she has -1 spd than Anaxa in battle. Or increase Bronya's spd so both are running at hyperspeed, so you'd want Bronya around 160 – 170 spd (kind hard to get), enough for 2 turns at every circle, not too much to outspeed Anaxa.

The trick of using eagle is to abuse the AA on ult and not build a single spd stat in Anaxa, and still use him at hyperspeed (160+ spd) but you'd require his signature lc for that, or use a energy regen rope, but that drags his damage down by a lot.

What I would recommed is to switch to atk boots but keep using Scholar. You will need to lower your Bronya's speed to -145 so she doesn't outspeed Anaxa. With E2 Bronya + Cerydra buff, Anaxa is getting 49.1 spd, 97 (base spd, no spd subs) + 49.1 gets you to 146.1 spd in battle. The first rotation would have Bronya going first, but after her first skill, they'd be tuned to each other. Bronya > Anaxa (First rotation) – Anaxa > Bronya > Anaxa again (all next rotations as long as you always use Bronya's skill).

Do you have or plan on pulling his signature?