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Yeah that can obviously happen that you might already be running on the fastest RPC node...I only changed mine once to a node that was only a little bit quicker, and I tried running another benchmark to see if any of the others were faster like a week later, but ended up getting the same result as you- the api.hive.blog node was/is the fastest one that I can run on...I just know that one or two people had mentioned that little trick back when splinterlands was like really slow & laggy a week or two ago. & because I do use hive keychain extension on my splinterlands account though, so it did have some effect at first..albeit very minimal. Always worth a shot though..🤷‍♂
Sorry I couldn't help out more!

actually, changing RPC nodes is useful very often, because the api.hive.blog node does get laggy sometimes. but I usually pick a random one from the list so knowing what is the 2nd / 3rd best RPC are is very good

Oh nice, that's definitely good to know for future reference then. I wasn't 100% sure what else that's useful for aside from splinterlands tbh.