The problem is that (from my experience) people don't want to trade their rares for uncommons. Especially if you're in the same boat as me where it takes 8 Uncommons/4 VUC/2 EUC to equal a rare. I'm not doing 1.125 between years before like, 2016.
I did do some math
on this post where with one of the methods, 1 2016 r = 1.16 2017 r (or like, 1 Rare, 1 Uncommon, 1 VC, and 1 OMGSC from 2017)
New Method is in Aqua here:

1 09 = 2 2010s (1:2)
2 2010s = 4 2011s (1:2)
4 2011s = 6 2012s (2:3) 2:3 is 1:1.5, which is a rare + euc
6 2012s = 7 2013s (6:7 = 1:1.16, seen above. Maybe round to 1.125 or 1.25, meaning a Rare+ Uncommon or Rare+ VUC)
7 2013s = 8 2014s (7:8 ratio is 1:1.14 - round again same as above)
8 2014s = 8.5 2015s (1:1.05 = R + Common)
8.5 2015s = 9 2016s (1:1.05 = R + Common)
9 2016s = 9.5 2017s (1:1.05 = R + Common)
9.5 2017 = 10 2018 (1:1.05 = R + Common)
10 2018 = 10.5 2019 (1:1.05 = R + Common)
10.5 2019 = 11 2020 (1:1.05 = R + Common)
11 2020 = 11.25 2021 (1:1.02 = R + Very Common)
11.25 2021 = 11.5 2022 (1:1.02 = R + Very Common)
11.5 2022 = 2023 (1:1.02 = R + Very Common)
11.75 2023 = 12 2024 (1:1.02 = R + Very Common)
Doing all of this math actually makes me think that either:
A) 12 2023 rares for an 09 is too little, because of the way it effects the rest of the rarity math.
Or
B: The rarity math is not properly distributed in my chart, and we need to revise.
Using Option A:
I could see, realistically:
09-2011 = 1:2
2011-2013 = 1:1.5 (R + EUC)
2013-2015 = 1:1.25 (R + VUC)
2015-2019 = 1:1.125 (R + UC)
2019-2023 = 1:1.06 (R + C)
Alternatively, if we're really on the 09 and 10 rares being even.
09-10 = 1:1
10-11 = 1:2
A biiig problem with this, though, is how that would 'technically' distribute how much an 09r is worth on a chart.
09-2011 = 1:2
1 09 = 2 10 = 4 11
2011-2013 = 1:1.5 (R + EUC)
4 11 = 6 2012 = 9 2013
2013-2015 = 1:1.25 (R + VUC)
9 2013 = 11.25 2014 = 14 2015
2015-2019 = 1:1.125 (R + UC)
14.06 2015 = 15.82 2016 = 17.79 2017 = 20.02 2019
2019-2023 = 1:1.02 (R + C)
20.02 2019 = 21.22 2022 = 22.49 2023 = 23.84 2023
Which.. oops, suddenly we're back at what is basically the +2+1 method.
Using B:
I don't know how we'd redistribute, my only idea is this (rares only, not VRs) and I'm spitballing with no real research done into this, just what felt 'okay' based on previous suggestions and input.

Which would put
09-10 = 1:1
10-12 = 2:1
12-13 = 4:6/2:3 = 1:1.5 (R + EUC)
13-2017 = 6:7 = 1:1.16 (Round up or down depending on year and preference, Rare + VUC or R + UC. Personally for me I'd be 2013-2015 = R + VUC 2015-2017 = R + UC)
2017-2019 = 10:10.5/1:1.05 (R + C)
2019-2024 = 11:11.25/1:1.02 (R + Very Common)
Edits:
Grammar fixes, some clarification, moved around some stuff.
Big Edit:
In option A, I realized that making it 09-10 = 1:1 would actually like, nearly halve the amount of rares it takes. Making the entire chart actually hit the 12-ish 2023 rares for an 09, like the other chart. And then everything feels like it falls together, though I do like my Option B better because the numbers just flow more nicely and the only rounding there is is in the 2013-2017 area.
Re-doing the math on Option A with 1:1 09-10 rares.
09-10 = 1:1
10-2011 = 1:2
2011-2013 = 1:1.5 (R + EUC)
2 11 = 3 12 = 4.5 2013
2013-2015 = 1:1.25 (R + VUC)
4.5 2013 = 5.625 2014 = 7.03 2015
2015-2019 = 1:1.125 (R + UC)
7.03 2015 = 7.91 2016 = 8.89 2017 = 10.01 2018 = 11.26 2019
2019-2023 = 1:1.06 (R + C)
11.26 2019 = 11.9 2020 = 12.64 2021 = 13.4 2022 = 14.20 2023
Which is a little bit over the 12 of the other chart, but does hit around the same area.