Persisting tense backshifting in the "i'd rather" hypothetical

Today I was discussing something with my boss and I said the following sentence:

I'd rather we experimented with things we haven't tried yet

I said that as a response to an idea of reusing an old piece of tech for our next project. I'm wondering whether this is correct considering the past tense in "experimented". Should I have continued on with that tense in the rest of my sentence? Like so:

I'd rather we experimented with things we hadn't tried yet

"experimented" is not real but unreal past, being required by "I'd rather." Its meaning is present. Therefore, the present perfect is fine to refer to things you haven't experimented so far.

Also:

• I'd rather we started experimenting with things we haven't tried yet.