Random offhand question
AFAIK your #4 and #5 skill use the offhand damage stat, and the first 3 the mainhead damage stat.
what aether said.
main hand weapons do damage on the 1-3 skills and off-hand weapon damage does damage for the 4-5. as far as i know, sigils of force do stack, but, there’s much better choices then that. the stats on your off-hand obviously benefit your MH with damage.
This link to the Wiki re Sigil stacking
http://wiki.guildwars2.com/wiki/Sigil
The notes at the bottom detail the stacking and how the effects interact. Pretty interesting stuff in there. Just a couple of the things. The sigils all share the same cooldown so if one procs, the others all go on cooldown for active effects. If two sigils with conditions on kill are used, only one will ever proc and that is the one that goes off first.
There are definately some sigils we do not want to stack.