Before even looking at your data, there are 2 things we can get out of the way –
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It’s not “ease hell” – because there’s no such thing as “ease” in FSRS. Even if you subscribe to the idea that “ease hell” existed with SM-2, nothing that has ever been written about it applies to your situation now.
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If your FSRS parameters are well-optimized, on a substantial amount of accurate review history – there’s no reason to think that your intervals aren’t growing at the right rate for you – even if that isn’t the rate you think they should be growing at.
Yep, your parameters are tuned to grow your intervals slowly. The FSRS Visualizer gives you an easy way to view that, without needing to remember which parameter does what. You’re assuming that is bad or wrong though, and I don’t think that’s necessarily a reasonable assumption. It’s possible your intervals are growing just like they should be. If they were really growing too slowly for you, you’d be substantially outperforming your Desired Retention (DR) – but you’re not.
This is probably one reason. I’m not saying you need to change your grading habit, but you might need to accept this as a natural consequence of 2-button grading. You’ve given yourself no way to tell FSRS that some cards are harder and some cards are easier.
This is probably another reason. I took a look at the collection you have synced to AnkiWeb and you’ve got about 700 overdue cards out of 1200 active cards in this deck. That’s a lot. It means that FSRS is working with a lot of older review history, and it still doesn’t know how you’re going to do on those past-due cards. That suggests that as you catch up with current, you’ll be able to re-optimize and get some faster growth.