do you think it is worth considering the glacial spike proc gems on the wep? Or is raks talon just too good.
No, the only time in the game where Glacial Spike proc is to be considered using, is when you do T0/T0.5 content, and can be used if you really want to when you are progressing in Darkness Falls, but for DF progress i recommend Skull of Nalas as that stacks up about ~1mil damage over 5 seconds (i think its 5 seconds, forgot since i haven't played in a while
), while i do think it is reduced by enemy DR and armor it should still out damage glacial Spike (that is not a certainty tho, i have not tested it: Nalas vs. Glacial Spike).
Glacial Spike was used WAY WAY back when the SynergiesMOD was rather new, and back then it was doing excellent damage, due to that it was changed by Salan and ever since, it has been rather "meh" and even bad, it's decent for T0/T0.5 but for DF it really does too low dmg.
I did try to see what kind of damage Skull of Nalas does, but TL2's combatlog doesn't actually show anything related to DoT damage in it, which means we can't know the numbers dot's actually do on enemies unless we use the GUTS tool which enables you to build mods on your own and mess around with coding etc, but as i have no experience and no desire to do that, i haven't