Moreland is misinformed.
I did some digging for you and got the straight dope.
NFX closed on the CHK acquisition on June 30th, 2016. At that time, the Stangl 25-16-9 6H was what we call a "DUC" (pronounced duck...as in feathers, quack quack), aka "drilling but uncompleted". They just hadn't fracked it yet. So NFX never had the opportunity to "retrofit" the well for reduced production, because it wasn't producing yet. This is confirmed by both the original 1002A filed by CHK on the well, which shows no completion, and also the 1073 transfer of operator form which in the exhibit lists the Stangl 25 as "W[aiting] O[n] Completion".
There is no updated 1002A filed yet on the Stangl 25 form NFX, but there is a FracFocus report on it which shows it was fracked from August 21st-29th of that year. If you pull the monthly production from the Stangl you'll see first sales in September, which confirms our diagnosis.
The Stangl 36 is a badass well, and it's production never diverged from normal decline all through 2016 at all, and especially not during the early summer, the time period in which your your payments dropped 2/3rds. What happened to you is this: The Stangl 36 was brought online in Feb 2016. It normally takes 4-6 months for royalty owners to get their first check on a new well....and that first check is usually a huge one. Let's say Newfield was really quick and got you your first revenue check at the end of May. That check will be for all revenue from Feb, Mar, and maybe even April. The check you received in June, when NFX took over, would have actually been for only the preceding month of production, or perhaps from two months back. The point is, your first check would have had more than one month of production on it, and the next check would have just been for one month. So the change from getting paid on A). multiple months vs just one, plus B) the production in month 4 being less than that of the first month or two due due to natural decline, equals your 2/3rds drop in revenue.
Newfield "restricting" the flow, "retrofitting" the well, or doing anything other than making as much oil and gas as they possibly can has absolutely nothing...zero...nada...zilch...NOTHING to do with it. I promise.
It is also worth noting that the Stangl 25 sucks compared to the 36. I won't belabor the offset drainage points, as Jeffrey thoroughly covered it above. The point is the Stangl 25 has made 20% of the oil that the Stangl 36 did. Unless there is some mechanical issue with the well (casing failure, massive sand production, etc) that caused them to lose part of the wellbore, I wouldn't look for anyone to come drill this section for a while.
Sorry to say, you are probably stuck with what you have for the time being.
Again, my $0.02, YMMV. :)
80-Stangl1002A.pdf (9.88 KB)
81-Stangl25FracFocusReport.pdf (134 KB)
82-Stangl1073.pdf (598 KB)