hey guys..
i was wondering are there any proper ways to achieve a 'balanced' sound when playing in a band?
problems that sometimes occur to my band are like:

1) guitars; lead or rythm or bass is too loud to the audience although it sounds balanced okay to each guitarist..
2) during heavy parts (i,e chorus, where all instruments and vocals play together) will 'sinks' the lead or rythm guitarist sound..like, it sound softer..although during intro is fine..
3) during heavy parts, leads will sound very pitchy..(pain to the ears)

so, any of u musicians ever faced this probs? what do you do? (like tweakings on the amps..)
how do you do soundcheck for your band?

hope you guys can help!
thanksss...