First off id like to say, at lvl80 I had alot of fun using a dual build like this, i just didnt have heuksal maxed..
It could turn out quiet strong, although i wouldnt like lightning that low cause you'll be slow, but theres speed potions to make up for that

I used to start with bow, wait for a nice crit and finish the opponent off with ghost spear mars, and i could kill other pure str glaviers with ease like that, you just have to time it right..
As for your set skills, id like to make some adjustements..
First of all you'll need arrow-combo skills to make a good bower, cause the 5-arrow combo will help you alot in the way of surviving..
Whenever your low on health just use the arrow combo, since it knockbacks you'll have plenty of time to pot yourself back to full health ^^
On your fire tree, i'd drop the fire wall skills, theyr fun to use, but in my opinion theyr useless cause 1nuke can easily break it already..
And if you plan on playing alot with glavie id get the Heuksal Spear series for Windless Spear, cause it can cause the opponent to get dull status..
And also get Flying Dragon series to start off pvp..
Only get these if you dont follow the strategy i mentioned though, cause id say if you start out any 1v1/pvp off with bow, you wont need either of these series..
Hope i helped and yay, my first post.. lol ^^
TM~