I just had the same problem and found this thread by googling. I did a bit of testing, and realized that for some reason the mousewheel scroll wont work on the soulgem recharge menu... but scrolling by tapping forward and backward buttons on your keyboard does the trick =)
Wouldn´t have tried it thou if goblinlord wouldnt have assured that it works =P
Happy recharging!
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.
Best Answer
If you're playing on PC, you need to install the Unofficial Skyrim Patch. If you're playing on an Xbox, you can transfer the save to PC, improve the weapon and transfer the save back. If you're playing on a PS3, you're out of luck.
This happens because Bethesda failed to implement smithing improvements for some items. The Unofficial Skyrim Patch fixed it, here's the changelog entry that lists which items were fixed.