question.....does that corner lamp use an amber or clear bulb?
reason i ask is....on my Harley's we've been putting Custom Dynamics LED "pods" in the stock housings with stock lenses. we use red pods and get way better results than with clear pods through the stock red lens......my front amber turn run/turn signals use amber LED's for the same reason.
Clear bulbs seem to work better in these. I use clear bulbs in the corners of both of my trucks, even in the smoked amber corners in the red truck. Amber bulbs just seem to make them dimmer. The color of the lenses is plenty to make sure the light comes through in a nice shade of amber.
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EDIT - If someone were to put LEDs in these though, I'd recommend using amber ones. I've always read that when it comes to LEDs, you ideally want the same color diodes as the lens you're putting them behind. Pretty much exactly in line with your findings on the Harley pods.