I don't see why that would fail. There has been some slurm bugs this could possibly be (where essentially raising or lowering the number of CPUs would get out of the bad behaviour). I have also tried to improve behaviour in general in https://github.com/nf-core/configs/pull/226, which would be interesting to know if it worked without doing anything - but right now I can't think of the proper keywords to find how to point to a custom configuration by URL.