Keep looking at the big picture, Matt. Look at your training overall! You're very strong, and you make steady progress.
I've thought a lot lately about a couple of things that may apply here. One is missed attempts. I tend to get really discouraged when I miss a top set rep. I walk away feeling like a failure, and feeling like the workout has been a waste of time. In fact all the lifts leading up to the attempt may have been really good reps, near my max, adding both strength and work capacity. But I don't usually see that. Of course, if I have a time-limited goal in mind, it's worse (like trying to get a certain weight before a certain date, etc.) Add to this people who say things like "never miss a rep" or "never train to failure" and I feel like that 1 missed rep is a bad thing, when in fact that attempt is exercise, and adds to your gains.
Related to that is the importance of finishing every exercise with some good, clean, excellent-form reps. I think that there is psychological benefit it that, as well as benefit in making sure that you do some good reps for better motor-pattern learning. So lately I've been trying to add in a sort of back-off set, especially if the top set has been a bit of a struggle. I take off enough weight so I can be sure that I can lift with really good form, and do a few reps.
That 500 isn't far away. For people lifting in the range you do, every 5 pounds is a big victory, and it well feel really great when it comes!
Our greatest fear should not be of failure, but of succeeding at things in life that don't really matter.--Francis Chan