monday and friday is just fine for the deca. however, since this is your first cycle, why 750mg/wk of sust? thats kind of high bro. stick with 500mg/wk. the 500mg/wk of sust with 300mg/wk of deca will put on a good amount of size if you eat, train, and rest the right way. if you use 3/4 of a cc eod, that will put you at 562.5mg/wk.
so draw up 3/4 of a cc of sust into one syringe, and draw up the rest into another. after 3 amps worth, you'll have 4 syringes worth of pre-loaded sust ready to go. add in the deca and enjoy the growth.
you could even add 100mg of the deca to each shot(figure out the math). this should help cut down on the pain alot of us get from using sust.
have a nice day