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I think there's a misconception here: just because your lates are excluded doesn't mean your accounts fall off.
Literally the specific payment history just goes away, but the tradeline will still be there with an open date and closed date and a few other details but that's not a negative tradeline and really with the way the algorithm works anything not negative is a positve.
You won't get a huge boost because you still have the BK but they do still factor... if you have no other lates you probably shift into a higher scorecard, plusses and minuses to that TBH and the BK is still a score killer regardless.
I would do what makes sense financially as long as you can qualify for the mortgage you want but odds are your scores probably increase some if you just hold pat till those lates expire... but 6/21 is literally 2 years from now, and that's a while. I think the key date that you're going to need to contend with is the date of that BK which I think is 6/18 from your post? There's some loan product restrictions around BK's which I'm sure some of the people on this board can tell you, but that's your date to plan around imo.
Actually funny, here's a post I just read on FHA, think conventional is longer:
So you're looking at like 7/2020 anyway for a first possibly mortgage app I think.
I'm still a little confused Lates are excluded at the 7 year mark from the date they occurred.
OC Tradelines are excluded roughly 10 years from the date they are closed; basically you closed the account but didn't bring the accounts current till 3 years later? I'm not sure that the time "this account falls off your report" as seen on Transunion is exactly accurate for the OC tradeline exclusion but regardless I think it's a bit of an academic point.
Anyway to your specific question, I would check scores once you get to that 2 year mark from DC, if you're ready financially and you qualify don't hesitate. Odds are you won't get that many points from the rest of the lates being excluded, possibly might even lose some and if your tradelines really are going bye bye and if you're going FHA (where you don't get a better deal for a higher FICO) then go.
If you aren't ready financially at that point, then wait it out. My recommendation anyway.