It is tough to plan around what the supreme court MIGHT do, but keep in mind those subsidies could be gone at some point during the year and since the advance credits are simply that - an advance - it's uncertain what will happen at tax return time if you received an advance for a credit that no longer exists.
If you go with a qualified higher deductible bronze plan you can also contribute to an HSA as another way to adjust your income and convert more.
If you really dial it on income, a silver plan is usually the way to go. Deductibles and copays and such also are reduced if your MAGI is low enough, but only if you buy a silver plan. To the point that the coverage is better than the gold plans even.
Example I just pulled off healthcare.gov for a hypothetical 35 year old male, single, with the $17,500 income proposed. $42 / month premium, $0 deductible, Max OOP $2700, $3/$4/$10/$200 copays for generic drugs, primary care, specialist, and ER respectively.
You don't get the reduced deductible stuff if you choose a bronze, gold, or platinum plan though.
Apologies for missing the capital loss limit earlier.