There is no need to pyramid the dosage of Omna or Deca.
You could frontload (to reach higher concentration in a shorter time)
Wk 1: 750mg Omna, 600 Deca
Wk 2-8: 500 x Omna, 400 x Deca
The winstrol should be saved for the end of your cycle, it will also assist with any estrogenic sides...