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Run energy changes sound like a good idea. IIRC this is already similar to how RS3 does it; Iwonder when it changed there. Though weight feels like it has no impact in RS3, so that’s probably a good way to balance it.
I don't think staminas really is that much of an issue, I mostly use my house to restore run energy or super energy potions. Actually not very often I have a need for staminas.