Train voice having 44Khz sampling rate

Hi! I have appr. 1.5 hours of audio voice at 44Khz and like to train a usable model from it. I don't want to retrain, as the pre-trained checkpoints are all 22Khz, sounding muddy and not that good. I tried training from scratch, specifying the correct sampling_rate of 44100. Reached 2000 epochs, but the inferred audio was way too fast, skipping words in the process.

What should I modify or patch in to make this work?

thanks!