The best combo for TS damage specifically I found was Vigi suit + Catapult, but I believe the true potential is perhaps in a 2xLiberation Crimson Bow + Vigi Suit.
Here's why -- the way you would typically stack damage is awkward with bows and primarily depends on EA mods and little on physical atk% mods. The catapult has low atk (as does the Vigi bow, but it has innate 40% ranged damage basically) and the catapult buffs TS damage by 2% per refine.
The crimson bow on the other hand will probably give you 2x the atk power of any other bow right now that a Shadow Chaser can use and with so much hard atk from the weapon refine + equip atk bonus, 2x AK cards will boost that tremendously which will then be amplified by the EA/ranged % from the vigi suit + faw + temp dex + etc.
This also opens up the versatility of the Crimson Bow for other skills -- it is extremely good/the best with feint bomb and is very good with aimed bolt.
The Vicious Mind bows have some potential too, and especially if you were to get 2 good enchants on it (like perhaps a general atk %, drake effect, boss atk %, boss def pierce, or flat atk). This one is much more RNG dependent ofc, but would beat the crimson bow on raw ATK and if it had good enough enchants would compensate for the missing 2nd card slot.
Still, catapults are CHEAP so buying and yolo refining them is not at all a bad idea... I just think you'll be somewhat disappointed in its performance compared to a crimson bow (I noticed a damage difference of about 5% on triangle shot, and I used no weapon cards, so with 2x AK in both, the crimson would beat it very handily.)
edit: if/when we get the jro SC ring, that will really make crimson shine
Edited by mildcontempt, 20 June 2017 - 07:29 AM.