If you calculate your hedge ratio based upon notional value, your hedge ratio is 1.2:1 based upon yesterday's settlements. You must account for the considerable volatility differences, however. Look at the 20 Day Historical Vol for each instrument - Silver is 3.21 times more volatile than Gold. That is not a subtle variation.
it is obvious that silver is more volatile. how do you weight to make the pairs both dollar neutral and vol-neutral?