That makes impossible to separate by size.
The rating which matters for pairing is your global rating. So if you want to separate, the way is to have different accounts for each kind of game you like to play.
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I believe the official answer for similar questions like “why does automatch/autohandicap use aggregate rank?” is that aggregate rank is more representative of your true strength.
Is there a true difference in strength between time settings, or are the variations mainly due to lack of data?
Obviously there’s no elegant solution to this problem, but if it is really inconveniencing you, why not try to play your correspondence games unranked for a while? Then your overall rank will gradually converging to your timed-game rank.
BTW this is hardly your fault, but a ton of your wins in recent (last 16) correspondence games come from one guy who only plays with you. So I am guessing the reason your correspondence rank is so much higher than your timed rank is that your friend Wenkbrauwwil has become over-ranked himself (perhaps because he used to play regularly but has gotten out of practice), and he will continue to be over-ranked for a while until you slowly bleed off all his rating points.
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The different totals for me playing 19x19:
Correspondence time-setting on OGS: 492 finished ranked games
Live time-setting on OGS: 286 finished ranked games
Correspondence games on DGS: 300 finished games, mostly ranked (current ranking 5 kyu)
Live games on Pandanet: 544 finished games (271 wins / 273 losses, current ranking 12+ kyu)
Games played on KGS: strangely just 18 registered, no clue what happened there (current ranking 6 kyu)
Fox: it’s been a while but several dozens of games (current ranking 11 kyu)
According to the avavt.github.io website I have played 1114 games on OGS, about 85% 19x19, the rest more ore less equal 13x13 and 9x9.
These are the relevant pie-charts:
It has been like this for a long time
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Hm, I have not thought of that. That fiend is one of the two people I learned how to play Go with, nearly 5 years ago. He used to play unranked (he doesn’t really care about his rank) but I thought it would be good for him to obtain a more realistic rank so I changed the settings. Especially because I try to persuade him to play other people too, besides me. But I can hardly imagine my ranking is affected that drastically because I have seriously been kicking his ‘behind’ lately. Up until spring this year I played about 10+ correspondence games at any given time. Around then I started to practice more live games, mainly not on OGS because of my issue but I simply like OGS the best, so I started playing mainly live-games on OGS and naturally became increasingly annoyed by the way the invitations are organized.
Maybe you’re right and I should change the game-settings with my colleague back to unranked.
Anyway, I just have to accept my limitations (and those of OGS 
) and create a second account as has been suggested a couple of times.
Thanks for the feedback and kind replies everybody. Much appreciated. You all deserve a ‘thumbs-up’ 
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