So, I'm trying to get my Sovereign and champions to be entirely archery based. I've equipped them all with the Cedar Longbow (which I believe is the highest level bow) but is that all I can do, bar raising their strength on levelling up, to increase their attack because, if so, archery seems a little underwhelming for signature characters in this game; whilst a normal soldier archer can be trained to Shock Troop level and made in a raid group to raise attack, there doesn't seem to be anything I can do to raise my unique unit's attack with their bows past 10 without investing in strength (which only gives a measly 1.7 upgrade in attack with the Cedar Longbow per two points).
This means that, due to the way in which this game calculates hits, I find myself missing quite a lot. I generally win battles very quickly against high HP low defense mobs because I just pepper them with arrows before they can even get close, but if I come up against anything with defense I'm screwed. The only way I can think of raising their attack with bows any higher is to start buying +attack jewellery for them all, but is there no other option? Is there no bow which hits similarly to the Lord's Hammer or some such high level weapon?