Palino oh, now is clear. First of all, this tournament is for all community, not just for me. With Mercurial Ladder and Nations League I aspire to find competitive and agile formats, so I really appreciate for your feedback. As of now what i think: 1) the highest tiers (where competitiveness is more likely is a king) should be affected less, distance is too long even with 5 easy wins in a row; 2) I couldn't see good solutions now - as you mentioned above - it's a risk to get just another Glicko ladder.
3) As an option it could be to use time decay for result points (so latest results will weight more).
So let's begin to play and to keep watch over this potential issue.