I don't have any specific advice but you guys are making me wonder.
After moving to a new house with a different arrangement (bigger screen, longer throw), my 1000 hour bulb wasn't as bright as I wanted it (well under 11 ftl). I switched from eco to normal mode, re-calibrated, and resorted to using a brighter mode for gaming or daytime viewing where I don't care quite as much about color accuracy.
I found a place that had all the BS about true OEM bulbs but at significant savings over other places. I bought a bulb thinking I would get maybe another 500 hours out of my bulb before I would want to switch. In all appearances it was identical to the old, at least that is what I remember at the time. Had osram stamped on it somewhere.
When I finally switched, I found the new bulb to be no brighter than the old. I also found calibrating to be more difficult, it seemed to run out of red sooner than the old one even, which effectively means even less brightness for accurate greyscale.
I've just been living with it thinking it was just bulb to bulb variation or my different set up making the new bulb not as bright as I would have expected, but now I think I just got scammed. The bulb works, but I don't feel like I got what I wanted and now I feel like I need to worry about premature failure too.
Live and learn I guess.