Re: Seymour pickup booster???
Any clean boost will retain all of the sonic signature of the pickup and guitar and just make it hotter as it goes into the amp. This may make the signal louder, or if boosted too much, will distort the input of the amp and drive the amp into distortion (a technique you can use for things like a Vox, Matchless, Marshall plexi, or other 1 channel amps).
If you have never used a boost pedal, take your guitar over to a music store that has one and try it out. (You live in Detroit Rock City, so this should not be difficult to do) They're great pedals and if you're in a band, you will need a boost for your solos. Just make sure the boost has true bypass, so your signal is unaffected when you're not using it.
It sounds like you have a couple of problems. The general rule of thumb is: NEVER CHANGE MORE THAN ONE THING IN YOUR SYSTEM AT A TIME. It is virtually impossible to hear where any improvements are coming from, or where added problems are coming from, if you change the pickup and add a boost at the same time. Try one piece, see where you're deficient, and then add the other. If you like the sound you're getting now, but just want to make it louder, try the boost pedal.
A nickel cover will change your tone, but I forget how + why exactly, and since all of my pickups are 'naked' I'll leave that for someone else to answer.
Hope you find this helpful!