Custom In ear monitor driver asembly and sound design

Hi all. I know this was discused earlier, but the topic is soooo old...
So, i made my own in ear monitors with Knowles BA drivers GV-32830-000 and, obviously the next few days i spent with the big issue (for me):
HOW DO I MAKE THE SOUND BETTER? WHAT KIND OF DRIVER COMBINATION SHOULD I USE AND WHAT KIND OF CROSSOVER I SHOULD MAKE?
So, probably the main question in this thread would be...... : Are there any templates for buildin your own decent sound with impedance, resistors and induction metering?
Is it possible to find a guide or something so i could build a better sounding CIEM's?

Thanks in advance.
Sorry for my grammar and English mistakes, im not a native English speaker so to say.... :)