I don't know. Trying to find out which strings would do what is a bit like trying to buy tyres without knowing the car. It depends so much on the combination of both that it's really impossible to say how it actually will sound. Just tendencies in best case.
To give an example: recently I put a set of HT Corum/Alliance on a guitar. Usually the Alliance trebles give me a very present tone full of higher harmonics, but on this guitar (probably because of the tension, because the guitar is far from being on a mellow side, they sound actually quite sweet.
Some people think, if they lower the tension, they get a sweeter, rounder tone, but it can be just the contrary.
Given all these considerations, as for nice round bass and sweet trebles you could use e.g. Aquila Alabastro LT set as a starter and see what it does for you. I'm affraid you'll not get ther in one go, though. A bit of experimentation is necessary.
best luck Robert
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