Per my PM reply, the tail-light out is down to blown fuse caused by the park-light sockets from the original headlights - when you remove the bulbs, the bayonet shorts to the socket and blows the fuse (and will do so repeatedly unless you address the socket issue)
As to performance (also from my reply), OEM harness is definitely not limiting its capability - you either have wired incorrectly or they are just poor performing lamps.
Maybe you can link those you purchased ........