Parcel Shipping Cost Optimization

I need to optimize our parcel shipping costs. Current situation:

Annual parcel spend: [Total parcel costs]
Parcel volume: [Annual shipment count]
Carriers used: [Current carrier mix]
Service mix: [Ground, express, priority breakdown]
Average shipment profile: [Weight, dimensions]
Origin locations: [Shipping points]
Destination distribution: [Zone distribution]
Current discounts: [Negotiated rates]
DIM factor challenges: [Dimensional weight issues]

Please recommend:
1. Carrier contract analysis approach
2. Rate negotiation strategies
3. Service level optimization
4. Zone skipping opportunities
5. Dimensional weight management
6. Multi-carrier strategy
7. Technology optimization (shipping software)