The network hash dropped but how about the difficulty? If the hashrate drops the difficulty should be reduce but look at the difficlty it is still the same as the past few months and the reward you are mining daily is the same as before this is just base on my experience because I am mining raven coin since January.
And the reason why the network hash drop it's because there is a little drop on hashrate my mining rig is mining with 90+ hashrate on average but right I'm only getting around 80+ and sometimes lower than that. So it means they are just drop mining hashrate a little so that it will look like they fix the FPGAs and ASIC issue.
Your data is way off, both the hash rate and difficulty dropped far more than that, for hash rate something like from 22 Th/s prefork to about 8 Th/s now (it fluctuates intraday), check it out:
and GPU profitability for mining RVN went from clearly negative (after fees) to being currently the number 4 in all coins in terms of profitability.