Well all ye non-believers ... when I ran the 60 profile, the tyre was worn all the way to the edge and the I slid the front more easily than on the 70.
When I used the 70 I've never gotten to the edge, there's always been a few mm left, and the tyre has only slid when the tyre was worn.
That was my experience FWIW
Bearing in mind that sliding the front is not necessarily just a result of speed, it can also be a result of how you're riding the bike.
Just my opinion
