My reasoning was that I use the 15 SP for double strafing

For INT over STR, you will have more SP and slightly, slightly faster SP regen. Archers should not invest in INT, so the few Airrivals Gold points’ difference between 1 and 9 will make virtually no difference in terms of SP regen. 

The main thing here is the max SP. I went with 1 INT, because I didn't think I needed the SP. My reasoning was that I use the 15 SP for double strafing as soon as I get it, so the max SP will only benefit me when I'm first entering a dungeon. Anyway, I hoped you could follow my twisted logic ^_^.

When you get into the game, put 1 point into LUK if you began with 9. If your close to it, around 7, that should be your first priority. After that though, it’s DEX DEX DEX DEX! You need to get this high, and ASAP. 

No other stats matter right now. 30 is a good goal for this stat. After you get DEX to 30, get LUK to 10 if it isn't already. If it is, work on AGI. 15 is a good goal for that, for the time being. Then go back to DEX. I'd say for every 2.5 or 3 points in DEX, put 1 in AGI.