Excellent build you have, that is my first character as well.
Summons work great (you only summon if someone notices you and you can't fire a shot off before they reach you). I personally felt the bound weapon conjuration perks were a waste. This is even more obvious after you raise enchanting.
I use a Daedric bow (enhanced with smithing), and dual enchants of fiery enchant(soul trap + small fire dmg) and I think paralyze if I recall correctly.
I'd much rather have those 2 perks back that I wasted on the bound weapons. Since the enhanced bound bow is nothing compared to a moderately smithed daedric bow. And then the fiery enchant at 1 second is a perfect enchant. Plus you can add another enchant once you get 100 enchanting(not add after the fact, but make another bow and add both).
I maxed Smithing and Enchanting, and was working on Alchemy. I personally think all my characters will max all 3 of those. Enchanting is nearly game breaking, and smithing makes you create ridiculous damage/armor. Alchemy is arguably as good as smith, but due to enchanting being so much more powerful than either, it doesn't matter as much.
Not to mention that I actually fully regret ALL conjuration perks. I still summon if the enemy(ies) are coming at me, but they are there to distract long enough for a shot, not damage. So having multiple (or more powerful) is a waste.