Backup Media Sets- Library Insert

Hi

I am running multiple server jobs pointing to the same tap taking as differential,Weekly and Monthly. Can anybody tell me the best OPP and AP ,i have tap library of 24 Slots available and the jobs are schedule as

1. Mail

2. Application servers 

3. File Servers

Differenctial - Sun ,Mon,Tue,Wed ,Thu

Weekly - Friday

Monthly -Last day of month

so please let me know how the media set can be defined, Now the jobs are asking everytime library insert

Thanks