First, I can totally appreciate why you did what you did. My headlights SUCK and I am working through a series of staged upgrades to improve that.
HOWEVER...(Don't you HATE that!?)
I don't mean to be busting your chops but HID lightbulb upgrades are illegal in the US. The biggest reason is that the hot spots for you HID bulbs is not in the same place as your halogen. That means the light hits the reflectors in different places and there is no way you can properly control and aim the light pattern. Don't worry, I don't know where you live and I ain't the headlight police. Anyone doing what you did just needs to be aware of the issues.
The only way to legally convert and ensure you minimize the chance of ticking off oncoming traffic is to replace the headlight assembly or in the case of sealed beam, you can just replace the sealed beams.
The first problem that leads to bad lights (beside poor engineering) is voltage. Depending on your wiring it is very easy to have excessive voltage drop in the wiring system. Typically, in a perfect system you should have about 13.2V at the lights. I have found in my system that my headlights are only getting about 11.8V and even based on 12.8V being nominal under US standards, I'm having a significant drop. I believe that it works out that I am having about a 25% drop in lumens compared to if I was getting 12.8V to the light and since it should get closer to 13.2V I'm having about a 30% drop from what I could be getting.
Whether it is a halogen system, a system like yours or a DOT approved HID system proper voltage is important. Some folks have reported with upgraded HID systems slow reaction to getting low beam up to brightness. While HIDs run on less current, they require a solid current source to the ballast to properly fire the bulb up to specs.
What I plan on doing is installing a relay system with larger gauge wires to apply the most voltage I can to the current lights. Basically, that means I would use the power I currently have to the lights to drive relays that, in turn, will apply voltage from upgraded wiring to the lights. I will be tapping off of + and - lugs up front that use large gauge wires that are directly connect to the alternator system and thus should have 13.2V nominal.
So, if that fixes my problem...DONE. If not...then step 2 is to install new headlight assemblies by Hella.
90mm-xenon-de-low-beam/
For me that means I am lucky that the assembly is a direct replacement to my current 90 mm halogen set.
For background on how I came to this plan see
Daniel Stern Lighting
Again, I am not trying to do anything but suggest alternate solutions that may avoid even needing HID upgrades or better running of an HID system.