Before I say anything - please do not be offended by what I am about to say - Please!
You have a basic $1000.00 transceiver, it's basic design is that it is somewhat a mobile that is designed to be a take along radio.
Its stock mic has been configured to be very good.
Most people looking for a microphone upgrade are only doing it because they do not have a radio voice and they are looking to compensate for what ever they lack in tone or quality.
It does not make much sense from a economical standpoint to buy a $1000 radio and then connect it to a $350.00 microphone - trying to make your audio sound better.
With most all communications taking place on single side splatter - all that counts is that I can hear you and you can hear me.
If we wanted broadcast quality audio we would either buy a radio station or we would start out with a much better transceiver such as the Kenwood TS 590 which allows you to tailor your audio and even listen to it on the talk back. That is about a $1500.00 base station transceiver that does not need any type of additional filter purchases.
You could spend $4500 and buy a Ten Tec Orion and then spend another $2000 on filters to do the same thing.
The only people that worries about their audio tends to be the vain or the AM operators. The AM operators tends to purchase the older equipment such as the Viking Valiant or the commercial Collins transmitters.
You can spend thousands of dollars on Behringer Boards or Bozaks and you can spend hundreds of dollars on Heil Goldline microphones, but the bottom line is that we are not supposed to broadcast.
So what does it matter what your audio sounds like.
Invest your money into more efficient antenna's and feed line, this will get you your best gains.
Buying a crappy radio and then hooking it up to an amplifier so you can make your signal appear louder only tends to distort the audio and make you sound crappy.
Radio is all about Db's - you can get good Db's of gain out of more efficient antenna's and coax or you can get crappy Db's of gain out of crappy amplifiers.
I'm sorry that I am making assumptions here, but I have been around radio a long time and I know from experience what I have heard on 10, 20, 40, 80 and 160 meters.
A million times I have heard the statement that they were using a G5RV and a 1000 watt linear amplifier and that they could work everyone they could hear.
Their problem was that the only people they could hear was their good buddies with the same set up.
When a person came with a good antenna, 100 watts, clean audio, and was not pushing their needle 20/9 - they refused to talk to them.
Please do not take my post as a personal assault.
Invest your money into a better antenna, good coax, a better transceiver..