Drop rates are the same, but each person RNG will vary between seasons. We can’t help you get better RNG.
To increase scream per hour, you just need to run more rifts per hour, which mean faster rifts, and less downtime between rifts. If you need help with that, we can help you.
gl
edit: had a quick look at your profile. It looks good, you got the right pieces in the right places of your death nova necro. There are a couple easy improvements to make though: You always want crit chance or crit damage over AD (your off-hand and ammy), rerolling those will be a big damage boost. There is no point rerolling damage range on your primal weapon. The damage type on the weapon doesnt matter, although I know that isn’t obvious, and there is nothing you can do about it now. Next time, the better reroll would be CDR to damage. You can easily craft better guardians bracers. You should be able to craft hundreds of them by now, so getting ancients with physical/int/vit/crit, and close to max roll on physical and crit, is very realistic.