Laserfibre Supreme 17 is the best multi with controllable liveliness that I have tried in my 6.1. I have been stringing at 60/62. I have found if you sting too high the Supreme seems to exceed its elastic limit and loses its outstanding playability. I wouldn't string above 63 on the 6.1.
I have recently playtested several multis at 60/62 that have 'tempered' power at that tension combo, TF x-1 Biphase 17 and Head FXP 17, and I am currently trying Head FXP Power 17. The FXP strings up a little firmer than either x-1 or Power and is definitely less lively than the other 2. The FXP Power has some very nice playability characteristics.
The other string that I play with in the 6.1 is Head Rip Control 17. This is a very soft multi that is not very lively, yet has a very nice playability. It loses tension quickly for the 1st few sessions after hitting, but then settles in and plays well for an extended period of time. It is also the only string I have played with that I feel actually enhances spin because of its construction. I string RC at straight 62. You have to work a little more with the RC than the others.
Wilson Reaction felt very stiff (more like a mono than a multi), yet very lively for me; Syntronic Brio played very nicely for a short while, began to trampoline a bit, then went totally stiff and boardlike; NXT OS was way too lively and a waste of the extra string length in the 6.1. Dunlop Max Comfort had a very 'dead' feel when I tried it. All trials were with 17 g.