Blue compromises foul weather visibility.
headlights get dimmer with age, they are shot before they burn the filament. Have you tried just a new quality bulb like the Sylvania XtraVision.
I tried HIDs in a vehicle that used a 9004 bulb which is admittedly a very different setup from yours and spent a lot more than $30 and it was more light but the scatter was BAD and I had to point them way down to keep oncoming driver's happy.
I'm running DDM and this is my third kit from them. They also come with a lifetime warranty. I've never had a problem with the products or customer service. The only downside is the long shipping time from china.
Oh, before I forget, I've ordered their "Raptor" HID kits in the past, but they've since stopped offering that particular kit. I have no experience with their newer kits, but they still carry the lifetime warranty, and the customer service, etc. is the same
When I get them, I am going to run them for a couple weeks and just get the feel of them. I will be getting that relay kit, though. I was also seriously considering the projectors as well. Just for Ejbiers.