if you want to get rid of one element, I'd recommend dark, or merging some of dark's techs into other hotbars for specific element techs you don't want to use. You won't be using many light techs other than a couple few, so that could be where you put them.
Directional techs on Talis will go in the direction you're facing when the talis is deployed, unless your crosshair is directly on the enemy's hitbox.
You'll want to use fast talis throw stance for when you want to regain PP, as you have no way to gain PP at range besides throwing your talis. Stances like Fast Talis Throw should always go on your Sub-Palette, NOT your weapon hotbar, as they are activated once, and then stay on until turned off.
Also, always always go for percent-based damage increases. Do not go for fixed TEC increases. (IE: don't go for TEC +50 in the skill tree.)