I wouldn't suggest a 4 day 3 day split. Spikes from sustanon usage are already high due to the different acting esters most including the faster ester caused from prop. Doing a 4 day 3 day split instead of a consistant E3D administration is inducing more of a spike in plasma levels.
Again, and I have shared this info many times. Sust is not meant for novice users and if you dont understand the ester mathematics sust is one of the worst drugs to start out with. The point of a cycle is to keep consistant plasma levels through out, reach a saturation phase quickly and hold it there as long as possible with out causing spikes in test levels, thus causing better gains and less side affects.
Here is my analogy to sust usage....
If you are on a high sea with stormy waves, the ship is being rocked up and down. Dont you eventually get sea sick and the ship seems to go nowhere. Then again on a leveled plain of water with no waves the ship moves more smoothly across the water and much faster.
In my opinion, first time users should always stick to single esters and easier drugs to handle such as Enanthate or Cypionate.