Thanks for the answer jdb - have a good new year btw!
Assumed sometime like setherick would have worked out some formula that says rb does a 5 yard rUn without contact = loss of 13% etc. I know how statistical some of the coaches on here are.
Tbh I would still like to know the basics - for example a number of coaches have advised me that I should set high skill positions like wr/rb/cb at low levels like 25-35. But surely they're doing more running so need more rest so therefore need it set nearer 100 whereas I assume the others will only drop 10 or so each play and rarely get down to 40-50.
Sorry if this sounds obvious