Not all RES are made equal.
I think theres several variables to consider now:
How big is the local Criminal Subfaction? 10% and over gives good spawns it seems.
How secure is the system? Might be wise hunting in medium security systems, and avoiding Democracies and Corporate States.
How valuable is the RES? A rocky depleted ring might have a HRES, but no Miner and thus no Pirates.
What was the time-of-day? Sounds obvious but even NPC pirates/Miners do not like boosting around asteroids in the dark.
I don't RES much, I prefer BHing targets in SC, Kill missions and Undermining Rampages...but last week I made over 6m in just over an hour in a RES in Ugrivirii (Patronage, medium-security ALD Control system) before icing an innocent by mistake (brainfart); sure that was 50% bonus thanks to ALD, but still, was a good RES.
So unless you're in a Pristine Metallic RES in a Dictatorship or at least Patronage/Communist System with a large criminal subfaction then I'd say it's jumping to conclusions to assert that "RES are borked again". People who reload constantly are missing the point, they should be moving on to find the best RES with the best conditions for good spawns, not reloading until chance favours them on the long odds.