3.25 Updated: Build showcase for Summon Skeletons of Archers

Yeah, with the incredibly limited amount of scaling options especially for skeletal archers which get no added bonus damage scaling or other multipliers all you can really scale it with is attack speed, crit strike+multi, buffs like the one from helmet and fresh meat, and plain increased damage or wither.

It's a very particular build and I think also one of the few minions that it can actually work on. Maybe it would work well with a herald of purity build as well. Possibly Summon raging spirits as well if you can convert all the dmg to chaos.

I forgot to come back here after doing more trials, but wanted to add some thoughts that I had and just didn't play around in PoB yet as life got a little chaotic.
I had forgotten about the helmet they added with uber uber Elder.
The Devourer of Minds would be a solid replacement for the Ancient Skull.
It would be a bit expensive, but that helmet and grabbing the minimum Frenzy, Power, and Endurance charge grand spectrum jewels would keep you at a constant 3 charges for each which benefits you and your minions.
The min endurance charge gem is the most expensive at like 50+ div, but you could run a minion crit grand spectrum in the meantime.

So for replacing the helmet and 3 gem slots on the tree you'd be getting:
+1 All minion skill gems
12% increased Attack/Cast Speed
12% MORE damage
150% Increased Crit Strike Chance
12% Elemental Damage Reduction
12% Physical Damage Reduction

No minions dying from Ancient skull lets you safely run AG, Carrion Golem, etc.