Try to put the ballast away from the engine as much as possible. those thing gets really hot, you don't want extra heat from the engine to cause any issue.
Except the light physically can't go any further down the road without changing the aim due to the cutoff and factory aim. Width will increase slightly but not by a large margin as width is dictated by the projector bowl.Emitting a light that is 3 times brighter than ordinary halogen bulbs, HID lights greatly assist the driver in providing a clearer and expanded view of what is ahead.
Chinese HIDs will usually take between 40-60 seconds to warm up. Using a relay harness helps warm up time slightly. Morimoto DSP ballasts are the quickest aftermarket ballasts on the market at about 5-10 seconds I believe. OEM is the best of all of course.HID's need time to warm up completely. Though 20 seconds do seem a bit much. Not sure if it's because you have 6k lights. And as far as the pinging noise goes, it sounds like it could be because your sub is picking up the frequency and interference from your cables. Example: you wouldn't want an amp power cable running down the same side of the car as your speaker cable because they'll pick up the interference thus causing the static