That vest looks like it's fairly useless for weather and temperature protection. The weather rating on the LG website is "light", and only having softshell fabric on the front is going to limit how effective it is at preventing heat loss.

Try going with a more substantial, full-torso (as opposed to just the front) softshell vest. Maybe one of the Foxwear cycling vests.

On the other hand, if it's not affecting your performance and not lowering your core temperature, maybe you don't even need to worry about it.

Edit: I just realized the Foxwear vest as a lighter back as well. You might even want to ask Lou at Foxwear about getting a vest made entirely of Power Shield.