Disliked30 pairs is a bit unrealistic. most professionals stick to one area for a longer time (exception of stock traders).
and among those pairs, many are postiively correlated or negatively correlated. so it wouldn't do justice by including more than correlated pairs. but i see your point, just trading 30 pairs is a bad bad idea....i dIgnored
Even if 2 pairs are correlated that mean nothing when you get a signal, if i get a Buy on eurusd and a buy on usdchf, even if they are negatively correlated i take both. If you have a plan, and everything line up, why you should not push the trigger ? if someone in the US need 200m CHF , do he need to buy some EUR too ? absolutly no, the guy dont care if eurusd and usdchf are -98% correlated, he want his 200m CHF. Correlation dont mean 1 pips up, 1 pips down, it can be 25 pip up , 1 pips down and etc.
For what i said about trading more thant 1 pair is realy simple, you cant be 100% right when you take a trade, but with a good strategy , a good way to protect yourself is by trading more pairs. even if your system have 90% win/loss ratio, that dont mean you can't have 20 lost in a row on one pair, but by trading more pair you reduce the risk.
Best Regards,
EricFX