I'm no longer losing coolant in the overflow reservoir after swapping hoses and using T-Bolt style clamps (not worm clamps) on the radiator hoses. The key was making sure the clamps were tight enough without tearing into the silicon hoses.
This is the Mishimoto radiator and hoses along with the clamps they offer on their site.
After I first installed it, I lost coolant at a slower rate after watching it over time. I went back and tightened some of the clamps even tighter on the hoses on the passenger side by the radiator cap and now my reservoir is at the halfway mark cold, full mark while warm.
I'm thinking the stock system hoses are just not sealed real well from the factory. Some are lucky and don't have this problem, but a good number don't have a tight seal. Would be interested to see if someone changed the factory clamps to T-Bolt style clamps to see results.
These are the clamps I used. There are more expensive constant tension ones, but I feel these do the job. I replaced all the factory clamps.
http://www.mishimoto.com/mishimoto-tbolt-clamp-225.html