Marathon Runner & Stamina Rec Up are good skills for Power Shot bows. Focus is available in High Rank on Lagiacrus & Kushala armor. Load Up you get from Zinogre U (which is also good for bows with Evasion & Peak Performance). Zinogre U is also good in combination with the Seregios Bow. And for me the 2 best bows in–game are the Seregios Bow & Dalamadur Bow (leaving out relic bows).