Entirely agree with you. Also, knowing a word and being familiar with a word is also something that strangely only comes at a certain rate. So while I still believe it doesn’t hurt to do more studying, I also believe it’s just not linearly proportional with the speed of acquisition. But more effort is always better than less
Also, don’t know your situation, but OP you squeeze 7-8h per day, also try to keep a way to be able to absord “day off” if you have any. If you have 400 reviews per day in Anki for example, if you miss one day you might very well having 800 the following day. Of course, it’s possible to avoid most of the time days off at all, but it’s more easily avoidable if you have less reviews in the first place.
Downscaling your workload can also be a challenge if you need at some point, so don’t forget to anticipate that. For example, if I know I’ll have 1-2 weeks of less time to study, I’ll start to reduce my new cards 1-2 weeks before that, to reduce the amount of reviews ahead in time.
So as long as you understand that Spaced Repetition is more like a train that once it’s moving you can’t really stop easily and that if it’s too fast you’ll just keep totally momentum, it’s fine. In general I try to tend to ~half the time I know I can spend on reviews only, the other half time is spent on “flexible things”, like reading articles, listening to podcasts … Because those things, if I skip them, they won’t “snowball” the following days