I can eliminate Frances Williams only because I've had it. It arrived with Sum and Substance and Mississippi Delta even though I mentioned I really prefer the small or mini hostas. This one is a giant.
Earth Angel has a bit of a swirl on the tips of the leaves. I was thinking Olive Bailey Langdon, but yours doesn't have as big of a margin as the pictures on hostalibrary.
When all is said and done, there’s more said than done.
Try this website - Mickfield Hostas in England - they have the England national collection of hostas and this webpage lets you search by broad characteristics. I've visited their nursery several times and plant to continue going; I love hostas and have a large collection. Whatever yours is, it's very attractive and I would love to have it here!
I received three from one person after telling her I only like small and mini hosta. They were Sum and Substance, El Capitan and Mississippi Delta. Obviously El Capitan was misnamed.