Strange splotches in my developed color negatives... help?

Hi all,

I recently began shooting film in a couple of rangefinders and as part of that effort I've also decided to try my hand at developing film at home.

I've shot a couple of test rolls over the past few weeks but every time I go to develop them I'm getting these weird splotches in my color negatives (scanned w/ an epson v300 flatbed scanner).

A bit of background on my process... I'm using Unicolor's C41 developer kit with a Paterson tank system.

To keep things at the proper temp, I'm using a heated water bath where I put all the containers of chemistry.

I use a timer app on my tablet with a series of timers for each step of the process.

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Any help / insights on what I might be doing wrong is greatlly appreciated.

TIA!

Ray[/FONT]