Modification and experimentation with bridge pins is ill advised and deemed as a desperate, inexperienced user's approach to achieving proper tone.

Here's the plain-English story.

The vibrations collected and transmitted through the saddle, bridge and wood top of your guitar (amplified by the back and sides (body) give you your tone. Tampering with bridge pin material is creating a scenario where you are introducing increased conflicting, out-of-sync vibrations into the bridge from a point other than the saddle and therefore, interferring with the guitar's natural inherent tonal characteristics.

The brighter sound you think you may be hearing is not necessarly an improvement, but rather an out-of-sync series of vibrations being introduced (transmitted) into the guitar body creating the illusion that you have made an enhancement, when in reality, what you've really achieved is you've compromised the acoustical balance and harmonics of your instrument.

Ask yourself... is this really the direction I want to go in, especially with a higher-end guitar?