I have to agree with pp, this is news to me but what you say makes sense.
We were told to use our nursing judgement to determine optimal UF (not great advice when you're new to a speciality
- but my "preceptor" was something else - oops, I digress). One of the nephrologists had a limit of 1.5 kg/hr, ours allowed up to 2.0 kg/hr, preferably in bypass (UF only) at such a high rate; you could run in bypass for up to 2 hours. Some patients, however, tolerated 2.0 kg/hr in dialysis mode quite well; needless to say, they were abusing their bodies... we did our best to educate, but usually with little success. But you already know that.
Some of my colleagues were obsessed with "challenging" dry weights until the patients crashed and cramped; my philosophy was to leave them a little wet if in doubt (not much, but with good VS and no c/o). Knowing how my own weight changes daily - and I don't have CKD - this is of course also true for ESRD pts and complicates finding EDW even more.
And some of my RN colleagues never even bothered to estimate dry weight - they would just do whatever the pts wished and let them go out with BPs through the roof (or in the basement) and what not. But of course you can't interfere in their practice...
We were told that "acceptable weight gain" for an average size pt would be 2-3 kg; this was true for many, but I have seen as much as 11 kg (!) successfully pulled off during a tx (using bypass and extending time with a doctor's order). The nephrologist was of course aware of this and no more successful in his pt education. Need I add that the pt has since succumbed to heart disease?!
HTH. Thanks for the info!