Great point. I did think that Seven and Janeway (who I agree were a very prominent pairing - akin to the attention given to Data and Picard in TNG) would help Voyager, but then discounted it a bit by that pairing only even existing from season 4 onwards. I don't think that's enough alone to explain Voyager doing 42 percentage points better than TNG (44.9% vs 86.9%), but it would certainly have helped a lot!