Well, I'm older, my metabolism, and training progress is slower than it has been in the past for me as well.
I'm up to 60 minute long runs now for the past 3 weeks at a really slow pace, averaging around 4.5 miles per run.
I'm trying to explore alternative locations for running. Someplace a bit cooler perhaps, higher up the mountain might facilitate a faster pace. 80+ degrees in 100% humidity with constant hills is just results in slow times for a slow, fat man.
I am down to 223 pounds now, but weight loss is slow as well.
A 10k seems like a brutal challenge at the moment. Comrades seems inconceivable. Nothing to do but keep running...