Can someone explain to me in detail how ballpark homers work. In particular:

What is a: #flyball b

Let is suppose that a roll results in #HOMERUN 1-8. Am I correct in assuming
that one rolls the twenty sided die and if it comes up between 1 and 8, then one
follows that with another roll based upon the ballpark lefty-righty homerun
factor (let us say, 1-10)?

Why do so many players have identical ballpark homer counts on their cards. I
have looked at about 20-25 power hitters and they all have 8 total dice points
of HOMERUN 1-8 (a seven counts for six points, a six for five points, etc.)?