c-41 trouble: Highlights blown / grainy / yellowed

Hi all.

I recently started doing C41 at home, and it's mostly gone well except that in many of my shots with sky in the background the sky comes out extremely grainy, with little detail visible and a slight yellow cast to the highlights. I am fairly sure that the problem is not my exposures. I suspect I may be over-agitating the film or over-developing it.

Can anyone provide any advice?

Thanks!

Examples? Could be incomplete bleach and/or fixing.

Also are you bleaching straight after dev or are you rinsing after dev? Do not rinse after dev, straight to bleach, or stop, rinse, bleach.

When you say "yellowed", are we talking RA4 prints from your negs, or scans from the film?