IMO Dav's Hope isn't all that important anymore since now you can actually find HGEs when you need 'em.
So after trying locating HGE's for a week, I once again find that Davs Hope is still as reliable as ever and I'm topping up till I'm full. I tried, with no real success to reliably find HGE - using all the agreed upon characteristics, Fed systems, Boom, Outbreak, War, Civil War or Civil unrest. In roughly 5 to 6 hours of seeking I found 3 maybe - so a hit rate of one HGE per 2 hours. Again, for me, its the reliance on these things actually spawning that irks me NOT the grind taken to do it. I, for example. don't care if it takes 10 hours to get the materials I need if they RELIABLY spawn. The issue I have with USS is its entirely RNG that they even show up!
On the other hand for example, I was just mooching through the bubble and I happened upon a system that was spawning 8 - 10 encoded emissions USS continuously. Independent system, feudal, no state. Who knew. In any case I loaded up on mats for about 2 hours in that single system then my collector limpet controller crapped out and stopped working. RNG.
So - Davs it is. After that, I'll be spinning up my combat/utility ship and running some missions to tidy up the remainder of mats I want. 30 Guaranteed materials every 2 minutes and between 3 and 6 data packages. 800 - 900 materials PER HOUR. Easy call for me - yes they are low grade but at that rate who cares.
[WARNING: the next commander to post (or somewhere in the next 3 replies) will post about how they always find HGEs no problem, or how they know where they can go to get HGEs ALL the time etc. etc. which just goes to show that we all have different experiences with ED and the RNG associated with it. Which is kinda the entire problem in my opinion. If they could be reliably found at all times I wouldn't care if they spawned only one or two items a time but hey ho there you go.
EDIT: Updated numbers