Opportunity scoring - Understanding the performance tab

[JEFODB]

Dear experts, 

A while ago we have activated opportunity scoring in our Sales Cloud V2 tenant. Except for some exceptions almost all of our opportunities are marked with a score of 99. Ofcourse, this is not the case. Even if we lose an opportunity with score 99, the following opportunities scores are not adapted accordingly. Do you have any advice how to adapt our model? 

Therefore, I had a look at the performance of the standard model we use. The following attributes are influencing our score. Could someone explain to me what this scoring between brackets means? 

• Probability (11.128) 
• Account Win Ratio (1.737) 
• Sales unit (1.4) 
• Sales win ratio (..) 
• Days since start (...)
• Days to end (..)
• Source code (..)
• Close data (..)
• Services offered (custom field) (..)
• Start Data (..) 

Thanks a lot for your advice, 

Kind regards, 

Jef