[n.s.]

I've had several losses of that magnitude (one time I lost 50 BB in just 3 hours!). After much thought, I think that each time I was certainly doomed by the cards to take a substantial loss, but I think every time I made it worse by tilting - perhaps as much as half of the money could have been saved had I played perfectly.

In your case, I think it's highly unlikely that you "did not go on tilt in the slightest and kept playing solid" - tilt is very subtle and even the best players suffer from it. There was a time when I thought that my ability to not tilt was perhaps my greatest strength, but now I've come to realize that my tilting is probably my biggest downfall.