A lot of helpful insight on the way. HID's are a funny subject. Usually the causes of glare are simple problems. Most of them compose of cheap quality kits. Regardless of whether or not you have a "knock-off" Kit or not, ballasts need to cool down.
Reflector housings are also used by top named manufacturers because of light output to the road. Examples: Volvo XC-90, Volvo S40 R, Nissan 350Z, Acura RL (Older Models), Lincoln Mark IV, Oldsmobile Bravada and so forth. They compose of D2R bulbs which are reflector housing specific and throw more light on the ground but don't have the distance of D2S and projectors. Most of the D2R bulbs have small "Casper Blades" (block light to the bottom of the reflector) to eliminate glare.
The problem with HID's in a halogen reflector is the visible spectrum of light is spread out more evenly and it must be installed correctly. The arc of light inside of the glass tube must be in proportion to where the coil filament in the halogen was or the light will not reflect properly thus causing glare. If you find that sweet spot, no more glare. Unless you start going higher in the kelvin ranges, then you're spreading out the frequency of light and it'll just be one big ball of glare. I'm gonna have to take a picture of the light on my bike to show you because it has a complete straight line.
Now I will agree with projectors. They are the absolutely best. Now if you don't mine sticking your $600 headlight assembly in the oven and risk melting it, by all means go for it. I prefer the FXR projectors. They are the FX35 projectors but with a clear lens and sharper cut off.
One company that has earned my trust and business is DDM Tuning. I bought there kit for my truck 2 years ago and are shining bright as day 1. My bike also has it. They specialize in parts for BMW, Porsche, VW, ect. And if anyone knows HID's, it's these guys. They cover their bulbs, ballasts, ignitors and harnesses for life. Yes, for life.
I bought the 4300k for my truck (OEM colour) and 5000k for my bike (hint of blue without sacrificing lumens) I got the kit for my truck for $65 shipped. Seems low doesn't it? But it's the best quality and best deal I've found. The single for my bike was $43. I only ran a single because after I got HID I never touched my high beam unless I wanted to flash someone to turn or move over or whatever. Keeping the halogen in there is a good idea because it's instant light that does not have to warm up.
So to each his own. Just sharing my 2 cents.