SAP Library - Find your answers

Hi gurus,

Need your help.
We are using the Setup Matrix functionality in order to incorporate sequence dependent setup.

Current situation:
1. PDS being used.
2. Routing contains 2 operations. Setup Group Category assigned to the first operation.
3. Ciffed Setup Group category as Setup Group.
4. Manually created Setup Matrix in APO.(Not using automatic generation of matrix therefore no characteristics)
5. PDS contains 2 operations each having 2 activities(Setup and produce). The first operation is having the setup group assigned to it and the relevant indicator for the setup activity is also set. The processing activity is of 1 sec for both the PDS.
6. Resource is single-mixed.

Suppose the setup matrix contains two setup groups.G1 and G2
It is maintained as:

Predecessor | Successor | Time
None | G1 | 1.0 Hr
None | G2 | 1.5 Hr
G1 | G1 | 0.0 Hr
G1 | G2 | 0.5 Hr
G2 | G1 | 0.75 Hr
G2 | G2 | 0.0 Hr

Now when I am converting SNP planned orders to PPDS Planned orders, the setup time(for operation 10) is being read from the setup matrix. Some orders are taking 0 hrs whereas some are taking 1.0, 1.5 ,0.5,0.75 hr. But since SNP is in a weekly bucket, the SNP orders after conversion to PPDS orders are there on some particular day of the weeks.
Now in DS board, there is a overlapping for the orders. Now when I run Reschedule the orders are been rescheduled but the time taken is 1.0 hr and 1.5 hr. It is not 0.5 or 0.75 Hr even though there is a different predecessor and successor.

For e.g..
Orders are scheduled like
G1(S=1.0 hr) -> G1(S=1.0 hr) -> G2(S=1.5 hr) -> G1(S=0.5 hr)
This is wrong I suppose
It should come like
G1(S=1.0 hr) -> G1(S=0.0 hr) -> G2(S=0.5 hr) -> G1(S=0.75 hr)

Can somebody help me with this.
What should be the proper sequence of steps to be used in setup matrix. Remember I don't have the option of optimizer. I can only use heuristics.
Which heuristic should be used in PP and which in DS. What should be the strategy settings?

Thanx a lot for your help!!
Sarvesh __.____._