Looking good man. Really happy to hear your going about fixing that swindling **** ass dealer's **** up yourself.
Regarding darkside, in your case it makes sense, especially with the long commute you do daily!!
It makes sense for anyone who doesn't corner hard enough to get the point where you MUST lean off the bike to make a turn at the speed you're going. If you sit straight up in the saddle around every turn, and aren't dragging things on a stock bike, a DS tire won't slow you down. If your like me and a few others on the board, who raised their bikes to gain ground clearance and charge turns at the "hmm not sure if going to make this turn" speeds, then DON'T DARKSIDE.
No it doesn't give more grip, in any situation, yes it's enough grip to still ride it fairly hard and have fun!