Condition Formatting - Can't get it to ignore blank rows

Hi everyone,

I am working on a document with some conditional formatting to add some colour coding.

It's all going ok, except that I need for rows with overdue responses (column k) to be highlighted in red.
It ends up highlighting all the rows which are also blank.
When I use format only cells that contain blanks - no formatting, it whites out all the colour except for a few seemingly random boxes covered by other conditions - no matter how I fiddle with the order.

Can anyone offer any help with this?

Document attached - highlighted all in red like crazy XD

Also, would there be a way to highlight the rows using a vba macro instead? Would that be more or less effective/prone to error than conditional formatting?

change the formula to include a check for blank cell

sucuri wont let me post te formula so i have to post the file instead X_X

conditional formatting is like that
takes a bit of practice to get used to the syntax as its slightly different to rest of Excel
you have to be rather exact with your absolute references (ie $ placement) in the formula as well as where it applies to