Even 250 is a bit low for that high of a volume. Are you running a brass nozzle or a hardened/stainless steel nozzle? Steel nozzles will require even more hotend temp due to their low conduction rates. Eg, with the stainless nozzles on a Bambu P1S, I have to run ASA at around 260/262 for higher print speeds.
If stringing is a problem consider increasing the speed of your filament retraction (not distance) You may also want to turn off z-hop. Sounds wild I know, but it does help- by not lifting the nozzle during a rapid move, it “wipes” the nozzle clean as it moves off the part and reduces stringing. Realistically you shouldn’t use z-hop at all unless you have a part with a very small cross section that keeps falling over when the nozzle wipes across it. Which ofc, the big print I see in the photo looks like it will have zero stability problems, lol.