The issue with the TSB and the inner reflector bowl failing only applies to the 2011-2013 Optima models, as far as I know. Don't think it affects the 14+ models.
The lifespan of a factory HID bulb is around 5-7 years. So it quite possible the OP is just starting to see the decline in lumen output 5 years later.
I would not recommend trying to install LEDs to replace the OEM HID bulbs. Instead, I would recommend going with a brighter, more powerful HID bulb setup to replace those.
We do carry the
OSRAM XENARC 66140 CBI HID D1S Bulbs (which are 20% brighter than the stock bulbs you have now were, when you first got them)
These are also on sale until the end of the year, along with every other item on our site. Let us know if you have any questions we can help with.