First things first. here is the build:
Stats Progression - STR . CON . INT . SPR . DEX : 1.1.0.1.1
CON: 40~60
SPR: 50
STR/DEX: 1:1
INT: 0 (Not needed)
On the first levels you should put the stats splitted to not suffer from the natural progression of mobs. Your damage even with low STR/DEX will do enough until Lv 60~ So you can invest in CON and SPR for survival and skill spam (first Tiers Oblique Shot and later on Split Arrow/Covering Fire).
Something to be aware of when you talk about Oblique Shot. Lv 1 the cost is 9 and Lv 5 the cost is 18. But the damage is not doubled! So you’ll be using A LOT MORE SP than needed! Conclusion: Even with this being our Bread and Butter skill for a long time, Lv 1 will be more than enough!
For Bosses you’ll have some good Burst skills on Multi Shot, Twin Arrows, Head Shot and Snipe.
As Crowd Control you’ll have Full Draw, Heavy Shot and Flu Flu.
For defense you’ll have the amazing Camouflage and possibly Cloaking, also Swift Step gives Evasion.
I’m not sure about Flare Shot, the damage sounds good but it will be at best a filler skill. (You can combo Flare Shot + Heavy Shot so the mobs will be knocked back where the second hit of the skill triggers).
The final mention on skills goes to Scan (i guess you can count on that as utility?)
What do you guys think? I’m accepting good criticism and tips for improvement!

