On a Stock 04 C5 what would be the best :

1- Rev Limit ? Leave it at 6200 or bump it up a bit ? if so then what would be the max ?
2- WOT Shift Points? Make them all 6000 ? 6100 ? Leave them alone ?
3- Shift MPHs ? ( 3.15 gears , 3.42 gears )
4- Down Shift MPHs ? ( Same gears as above )

Thanks in advance guys