While this is little contradicting to info present here, I personally prefer to maximum utilize 30% of any given card (Not all), and max 8% of aggregated limit of all my credit cards.
If I happen to have bought something exceeding 30%, I tend to pay off before the possible reporting of it in CIBIL, every bank has different reporting date and this usually not in line with statement date. Many people mistakenly think if they pay it before statement generation it wont matter, but that's not true.
This is just my humble opinion and thumb rule I follow.