Have there been any changes to the encounter spawn rate?

Either there must be some trick or I have the worst luck...

I've made about 5 1-hour runs from Eveningstar up 'or down' to the Underdark

Each of those runs ended up giving me 1 encounter per run...maybe an occasional 2 IF I was lucky (most of them were repeats yielding 0 commendations; usually the PDK Collar one)

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Is this normal?

Is there some trick you can do to force more spawns?

Is there some path I can take to yield the highest chances at a spawn in the least amount of time?

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Are the rare encounters Lottery Spawns? (each kill results in a % of an rare spawning?)

...if my above results are common then the spawn rate needs a good +30% to whatever it currently is...