Adjust my sound!!!

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Hy there!I have fender stratocaster with 3 singlecoils which are so ****'d up
and marshall avt275.I don't know how to adjust sound 'cause when I find a really cool sound I play a rythm with it,but when i try soloing with bridge singlecoil the whole sound is crap!The sound is so not good for soloing with bridge singlecoil so I took that 3 band equilaizer in my hands and did this:

bass 3/10
middle 10/10
treble 6/10
presence 0/10 or 3/10

Now soloing with bridge singlecoil sounds better but this is ****ty sound so I'm asking YOU to help me to adjust my sound 'cause I'm DESPERATE!!! :eek:
Thank you

I don't really know the amp in question, but there must be a way to get a good sound out of a Strat through Marshall. I have a crappy VS 30R, but when cranked it's quite pleasing to my ears. And a lot of feedback to play with.
Obey the following and thou shall have all the blessings of not-crappy tone:

1.a. Too much bass = muddy sound with no definition.
1.b. Not enough bass = wimpy sound.
2.a. Too much middle = mid-position wah sound, 80's solo perhaps, bad for rhythm.
2.b. Not enough middle = instant thrash rhythm, not enough body for solo.
3.a. Too much treble = screaming, ear piercing sound. The dogs will obey thou.
3.b. Not enough treble = too soft, doesn't cut. Incidentally, similar to 1.a.

The rest is up to your ears.

do you bother adjusting the guitars tone controls?
maybe that is your problem.
if the tone is too high in them bridge pickups it can sumtimes sound like crap