Unfortunately it sounds like there’s not a lot you can do – if she’s growing well then any changes you make could hinder that. Crispy tips on plant leaves happens a lot, even in the wild in pretty perfect conditions.

You could try watering a little less thoroughly but obvs it’s a fine balance between underwatering and overwatering. You could also try filtered water BUT the chemicals in the water you’re using may be helping with growth.

I appreciate that this isn’t very helpful, but unfortunately plants only care about growing more leaves, not aesthetics, and once alocasia start growing well changing things up can cause them to sulk.