Jacob,
I highly recommend you both Update 3 and 4 of Craig Ellis “PzKpfw.IV At the front” series.
They are available here both as a hard copy and e-book:
https://www.blurb.co.uk/user/8wheels-good
When it comes to Pz.IV. Ausf.G/H details and specifics these titles are my Bible,
HTH,
Cheers,
Angel