Newer Heilo cards imply DK gauge for a Sport weight classic. I say stick with the 6 sts/inch gauge, used for decades.
Vintage grey Heilo, pulled from my stash, with all 3 ball band gauges = 24 sts / 4″. Brand new off-white Heilo, far right, with ball band gauge = 22 sts / 4″. All 4, old and new, weigh 50g, with length = 100m. The product is UNCHANGED! I guess the new, looser suggested gauge is an attempt to associate the same old Heilo (and Falk, too) with lighter weight, more flowing, contemporary designs. Although decades of sport weight Dale designs using Heilo suggest the time-honored 6 sts/inch sport weight gauge, some of their recent Heilo / Falk designs are done at 5.5 sts/inch, a typical DK gauge. Thanks, but I’m sticking with the time-honored 6 sts/inch sport weight gauge …for sturdy, warm sweaters with crisp colorwork. (And for hats, mittens, socks, I shoot for 7 sts/inch.) If you want a lighter-weight result, simply use a lighter weight yarn!