Well to start off it depends on what your lie is.. are you hitting from the fairway or the rough? and also what is the elevation.. and wind speed and direction
I see your using the SD balls so youre going to add a little distance to your shots..
But lets say its a failry flat shot with almost no elevation and very little wind..
for your first shot.. when youre shooting a Z wedge less than say 75% with a "full" shot then youre going to have to add about 10% power.. I couldnt tell you why this is but thats what ive seen.. so your first shot would then turn into a 76% shot.. and while this only seems like it would add about 5 yards to the shot you actually took.. it will in fact put the shot over that 75% mark and the swing will act correctly..
On the 2nd shot however... i would suggest anything under 30 yards or so..(with your wedges) that you use the pitch or flop shot.. but remember your pitch shot is going to roll once it lands (depending on elevation and distance of shot this can vary from 2-6 yards.. you'll have to figure it out and judge.. and your flop shot when dinged will shoot 2-3 yards to the right every time and has some roll (depending on elevation and distance this can range from 1-4 yards) therefore you need to aim left accordingly
you just have to play around with it a bit...
MY ADVICE... drop the ping driver and get an extra wedge.. something with a closer range.. like the 50 yard Z wedge... that way you can handle those closer shots better and it adds an extra yardage for chip,pitch,and flop.