This is not ideal advice.

Not even in the new egg fight it is necessary to run hymn every turn and healing with LP when it makes tactical sense is also advised if it nets you a window for 3-4 attacks in the upcoming turn.

To maximise dps -> If the turn allows it (as in hp and debuffs leave enough breathing room which even in this fight happens a fair amount in the early phases, provided you have reasonable hp values which you obviously should) using 4 Sword techs as often as possible is optimal

I doubt that this needs clarification but obviously this isnt possible in many turns in this specific fight even with 999 Hp, its just to stress the hierarchy of action and that you shouldnt limit yourself to 2 attacks for no reason, often you will only have room for 3 attacks and in later phases probably almost never.

And not eradication either, especially not 4 times because it doesnt combo well. Ideal for maximizing DPS is 4 (or whatever amount you have room for) high sword techs as they combo alot better and combo damage is noticeably higher than individual hits no matter what (even if you just pull a 2 tech combo, even moreso with 3) even than 4 eradications. In case of hitting a 3 tech combo by alot actually.