Hmm, the only thing odd about the current RT sRGB profile that I can see, is the 4096-point TRC.
I was going to say that my V2 point curve profiles use 1024 points. But I double-checked to verify after I saw your post, and in fact even though I intended that my profile-making code copy the 1024-point curves from some included “sample V2” profiles in the code folder, somehow that isn’t happening. Instead my V2 profiles have 4096-point curves just like RT profiles.
By the oddest coincidence I got a private email today (just now in fact) specifically asking about those V2 point curves. When it rains, it pours 
. Anyway, I will do my best to fix my code so that the V2 profiles with point curves actually do use the intended 1024-point curves and not 4096-point curves.
Which of course doesn’t guarantee that problems with the printing of your images will be solved by using 1024-point curves. But I’m very grateful to you and also to the person who emailed me about the V2 point curves, for having taken the time to point out this fairly serious problem (well, I think it’s a serious problem) in my V2 profiles.
My apologies! for failing to double-check something so basic as “Are those V2 point curves really 1024-point instead of 4096-point curves”.