The nose cone would only marginally affect the air stream in the area of the root, which is totally useless as far a power output is concerned, where the nose cone actually is right on the hub it should make nothing other than an esthetic difference.
Also anything more than three blades is a total waste, that WILL cause a power loss, it's been shown over and over, yet, you still see these carpet bagger scammers sellling turbines with 5,6,7 blades. One blade is best but a nightmare to balance, two blades are second best but yawing in turbulent winds can be horrific on a two blade machine.
So we are left with the trade off of three blades, Virtually every utility scale turbine you see has three blades, AND, a nose cone.
They don't build multi million dollar turbines without a LOT of R&D.