Excel formula Help

I am getting a false return in cell K11 and I would like some help to add the correct formula please.   It only reads false when the figure in G6 is greater than 17.

The red formulas are only because they are the formulas I needed

Our employee wants to be only paid 55 hours of his pay each week;

- We always pay him the X 2.0 overtime hours first. (from G6), K11 shows this.  BUT if I put in 18 hours the result I am getting is false.  I presume because it wants another formula in there to tell it to only keep the 17hrs in cell K11 and move the balance of 1 hour to the overtime schedule in column O11.

Further explanation of the spreadsheet:

K10 shows 2 hours which is taken off his x 1.5 hrs (G5) to bring his total of hours to 55 which he has requested to be paid each week.  

Then we need to record the balance of hours remaining in his overtime schedule.
O10 shows 18 the balance of his X 1.5 hours (G5-K10)
O11 shows zero currently which is not always the case as sometimes there may be some hours to carryover after the calculation in K11 is complete.

Thanks in advance,

Wendy