Just a few comments from someone relatively new to mania (my ranking used to be around 880).
I agree with all the previous comments saying that auto-converts should be weighed a LOT less than mania specific maps. No matter how hard the song is in osu mode (lets say FOUR DIMENSIONS Freedom Dive, or 0108 Scarlet Rose, or even Madness Precipitation for 狂気ちんでん), auto-converts never reach surpass a certain level of difficulty. Unlike most MX or SHD maps (or even HD maps), auto-converts never include (from my experience, not necessarily accurate, sorry if I'm using personal terminology, I'll try my best to be clear, I might be editing this list):
1. Holding long notes before the previous long note is finished (nearly every HD+ map includes holding long notes halfway into another long note, or letting go of one long note before the other one is finished, if you really need an example, fripSide - future gazer http://osu.ppy.sh/s/115715)
2. "Burst" maps, even though not necessarily a good determinant of skill, but still a good reference (i.e: KOTOKO - unfinished http://osu.ppy.sh/s/102519)
3. Melodic sweeps (I'm not saying the occasional 5 note sweep, I mean shit like MEPHISTO MX) and sweeping holds (bj. Halo - Ende SHD http://osu.ppy.sh/s/79132, or MEPHISTO SHD)
4. Actual beatmaps, not rhythmmaps (Silent Siren - Stella http://osu.ppy.sh/s/81166)
I'm perfectly aware that 4k can definitely get as hard as 7k, but I also believe that 7k should be the standard for mania (or else why would the system be limited to hitting a maximum of 6 notes simultaneously). Anything out of 7k should be left just for recreation purposes, and should be weighed less in comparison to 7k. Accuracy shouldn't be weighed as heavily as in other modes, as it would just encourage people to play auto-convert and easy maps. You could consider counting the MAX to 300 ratio, as I think that would be a rather accurate way of determining one's skill. You're making a brilliant move in tallying all scores (not only the top 50), as all mode-specific maps are a hell lot harder to go into top 50. All mods should be left the way they are right now.
I'll try to add to this whenever I have time, quite busy right now.
I agree with all the previous comments saying that auto-converts should be weighed a LOT less than mania specific maps. No matter how hard the song is in osu mode (lets say FOUR DIMENSIONS Freedom Dive, or 0108 Scarlet Rose, or even Madness Precipitation for 狂気ちんでん), auto-converts never reach surpass a certain level of difficulty. Unlike most MX or SHD maps (or even HD maps), auto-converts never include (from my experience, not necessarily accurate, sorry if I'm using personal terminology, I'll try my best to be clear, I might be editing this list):
1. Holding long notes before the previous long note is finished (nearly every HD+ map includes holding long notes halfway into another long note, or letting go of one long note before the other one is finished, if you really need an example, fripSide - future gazer http://osu.ppy.sh/s/115715)
2. "Burst" maps, even though not necessarily a good determinant of skill, but still a good reference (i.e: KOTOKO - unfinished http://osu.ppy.sh/s/102519)
3. Melodic sweeps (I'm not saying the occasional 5 note sweep, I mean shit like MEPHISTO MX) and sweeping holds (bj. Halo - Ende SHD http://osu.ppy.sh/s/79132, or MEPHISTO SHD)
4. Actual beatmaps, not rhythmmaps (Silent Siren - Stella http://osu.ppy.sh/s/81166)
I'm perfectly aware that 4k can definitely get as hard as 7k, but I also believe that 7k should be the standard for mania (or else why would the system be limited to hitting a maximum of 6 notes simultaneously). Anything out of 7k should be left just for recreation purposes, and should be weighed less in comparison to 7k. Accuracy shouldn't be weighed as heavily as in other modes, as it would just encourage people to play auto-convert and easy maps. You could consider counting the MAX to 300 ratio, as I think that would be a rather accurate way of determining one's skill. You're making a brilliant move in tallying all scores (not only the top 50), as all mode-specific maps are a hell lot harder to go into top 50. All mods should be left the way they are right now.
I'll try to add to this whenever I have time, quite busy right now.