Please rate my Mergen build ( C2 Archer> C1 Hunter > C3 Scout > C1 Falconer > C1 Mergen. Full Dex Build this will be a pure PVE build for farming silvers in solo 145 dungeon runs.
im a A3 S3 falconer mergen lvl 284
i can say that with falconer circling, its better to max Koochaksal than spread shot. spread shot is not worth it tbh 
From that simulated build I can tell you have no actual in-game experience on an archer of any significant level. That build is TERRIBLE, for starters throw the hunter circle in the trash straight away. Scouts have several different ways you can go but none of them include hunter in any shape or form.
The most common scouts in ITOS are archer2-ranger1-scout-3-rogue1-mergen1 and archer3-scout3-falcon1-mergen1
In KTOS the popular farming version is archer3-scout3-SR1-merg1 and with premium companions getting 2 equipment spots this build in the future is going to be OP b/c you will be able to get insanely high stats on the pet, which you then get a portion of yourself
Asfar as the skills go, spread shot is currently the most broken and useless skill of any archer class period, do not invest ONE let alone 5 points into it. Since you want falcon 1 in your build homing arrow will need to be 5/5 and will be an extremely powerfull aoe skill for you due to circling. Outside of homing arrow you will want triple arrow and arrow sprinkle 5/5.
I have taken 2 different scouts to 330 and have had mergen capped since about day 3 of its existance so this isnt theory-crafted advice, just trying to save you alot of time and money on a re-roll, good luck.
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Hunter >
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If you want to build this character solely for 145 solo dungeon run. Any SR or Scout 3 should be fine but if you are looking for the end game content SR would be a safer option.