The more pools you sue the better. You want to catch every fast block no matter where it is. I am sure there is probably a limit, but I would say add as many as you are comfortable with.
Thanks for this info, also, one more question, should I use only PROP pools or PPLS too? I've read somewhere to not use SCORE pools untill next update because that will hurt your income.
I would stick with PROP pools for hopping and PPS pools like arsbitcoin for backup.