Coley,
Good to here the Loon product is working well for you. I was using Knot Sense Sense. A fly shop employee had told me all the Loon uv products were the same, just sold under different names. That obviously isn't true based on your experience.
The light I used may have played a bit in the tackiness of the Knot Sense as well.
I only had one of their tiny key chain type lights so I used the CCG light on it.
I hear you about epoxy. I doubt I'll ever use it again. The uv cures are just way to easy.

Based on my research, it seems the light plays a large role in the final curing process. Different lights may or may not fully cure with the different uv products on the market.
I have noticed that changing the batteries also helps. Fresh batteries seem to improve the curing process.
SF