Bows and horses are nothing more than "archery" and "shelling", and their skills are basically fixed. The key is to see the equipment. What equipment is suitable for what training method. Apart from the best yellow clothes, AMA's best bows are "confidence" and "the power of the wind". (For a single machine, both are difficult, the latter is fine, and the former is still difficult. ) archery requires high attack, so it can give full play to the characteristics of archery, so the wind is suitable for archery. Shelling requires firing speed, so confidence is suitable for shelling.
The above is the general concept.
Back to your specific question, the shelling should pursue the firing rate (which is also the reason why Mavina is not good). Generally speaking, among several bows (cannon, wild string and harmony) that are easy to be produced by a single machine, wild string is more suitable. At this time, skills are full of bombardment, infiltration and Valkyria. Total passive skill 1 point, so it is roughly shaped. Next, because there is a very high deadly attack in the wild, it is enough to cause a fatal attack on yourself. It is enough to break through the level 9 skill band to 100%. The rest is very casual, you can add bait (Valkyria bonus), add three flashes (I don't recommend you to do this, the three flashes of PVC are meaningless, there is a bug, that is, three flashes appear during shelling, although the shelling action continues, but it does not cause harm), and add magic arrows to break things (although high-speed shelling, the breaking effect of Ye+Yatema is very good). I don't think KBOSS is fast enough, stab a little. If you don't take the wild, then throw a more deadly attack.
Above.