I didn't read the whole thread past a few posts but you were given good but not ideal advice...maybe someone already mentioned it but
IDEALLY fico only likes to see 10% and under usage...now if you run it up to max then pay it off before its due date...thats great, but its reporting date is probably different
ie: one of my credit cards is due on the 11th but the statement cuts to the credit bureaus on the 30th..so if I have a balance on the 30th it gets reported then, whether I pay it by the 11th or not
usage is good for about 30% of your score...I generally ignore this unless I'm getting ready to make a large purchase...like when we got the mortgage I didn't charge anything to anything for 6 mths
I also don't keep any card that has an anual fee and doesn't have some sort of rewards program and doesn't have at least a 5 figure limit
fico also likes to see two credit cards that aren't store cards, ie amex, visa, mc or discover, one installment loan (car, personal loan) and one mortgage
paying in full is good but its not the whole equation. it looks at age of accounts, payment history (one 30 day late will totally fuck you) and credit types as well as some obscure shit like your limits etc