UPDATE: Unfortunately, the BeQuiet heatsink does not fit with my current build. The height clearance seems fine, however the socket on my motherboard is so crowded that I cannot lower the heatsink enough to contact the CPU. However, after some more tuning and shoving the larger Noctua fan into the case for some extra airflow, I have been able to get my idle temps down to the mid 40's, my fans noticeably quieter, and with my thermal throttling limit forced to 80C, I get a sustained 3.9-4GHz. Overall, I'm going to call it a success for now. Thanks everyone and especially @WoodenMarker for the help!