Well, you seem to have everything set up properly. One thing you should check is whether the HDP 269 is actually receiving power. Normally, if a pre-amp is not being powered, no signal passes through it and the lack of power is obvious, but the HDP 269 is an exception - it passes quite a bit of signal even when not powered. I know this because I have one, and once forgot to reconnect the power supply. I was most surprised to see I still got most of my strong local stations (but not the weaker ones). You do have it's power inserter closer to the antenna than the distribution amp? Just a thought!
Channel 33 (2.1) at -17.9 dB noise margin could never be received at that signal strength. You would need an antenna with at least about 18 dB gain to be able to decode it (and the gain of yours is rather less than that). This means you can only receive it when you have above-average propagation conditions (some degree of tropospheric enhancement). These enhanced conditions typically do not occur very frequently in winter, so you're never going to get that station reliably. You could try a higher-gain antenna (like the 91 XG) - or even a stacked pair of them - to give you reception more often, but it still won't be enough to bring it in reliably.