http://www.arcticsilver.com/arctic_s...l_adhesive.htm
"Superior thermal conductivity._ Greater than 7.5 W/m°K_"
Uuh. Big jump. 1.7 is waaay low by comparison.
If you really want to use that Epoxy , mix it with Artic Silver 2 or 3. 60 (AS)/40 (adhesive). I think it'll work .