Arbalests are one of the unloved low-end weapons in Starsector. An 8 OP medium ballistic, they're frequently compared to the two premium small ballistic options of the same cost: Light Needlers and Railguns. Both match the Arbalest's range, The latter matches the anti-shield DPS and the flux cost of the Arbalest with a strong (and critically, accurate) up-front burst, the former exceeds the Arbalest's damage and is pin-point accurate while remaining fairly efficient. Players frequently state a preference for either small weapon to replace an Arbalest
even in a medium ballistic slot. Within its size class, one only needs to scrounge around for 2 OP more to find the Heavy Autocannon, a ballistic weapon with more range and far more DPS which makes it far more difficult to replace with a small ballistic. Seemingly surrounded by all sides with solid weapons, the Arbalest can feel like its role is a bit crowded out.
In my opinion, the Arbalest can be made significantly more appealing simply by emphasizing its strengths just a bit more: namely its relatively heavy damage per shot for its size and flux efficiency. I suggest increasing the damage/shot of the Arbalest to 200 (from 150) and increasing the flux/shot to 150 (from 120), while increasing the refire delay by ~0.2-0.3 seconds (from 1.0) to keep the raw DPS in line with the original.
Such changes would result in only a minor DPS increase (~160, from 150) and flux efficiency increase (~0.75, from 0.8 ), but it does help the weapon stand out against smaller premium ballistics while not flipping the table of weapon rankings within the medium ballistic bracket.
For instance, compared to the Railgun, the tweaked Arbalest is just within spitting distance in terms of overall damage output (160 vs 167) while maintaining a moderate advantage in flux consumption (0.75 vs 0.9) and a large edge in hull damage and armor penetration. There may still be reasons to under-size a mount with a Railgun, but that decision is far more difficult to make with only a simple change. Importantly, the relationship between the Arbalest and the other medium ballistics does not change from this minor tweak: The Arbalest remains a flux-sipping, a short-ish ranged kinetic option with fairly hefty individual shell weights, while other ballistic weapons (Heavy Autocannon namely) tend to be more premium and well-rounded.