You know most of that RAM matters during the IBD, right? Have you tried re-downloading the whole chain from scratch? See how much time will take?
I also fail to see how Knots is the problem. Maybe you wish to elaborate.
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core runs on an rpi. knots does not.
therefore, running knots is not the solution, it is the problem
it's been a long time since i did an ibd, but i'll think about testing low memory configs. are you running something like start9 or umbrel? and how did you install bitcoin? 
