I would suggest after each decision to change the score variable instead of the request object.
The change variables blocks would then contain the following:
‘ $Score + (changes to the score depending on the decision)’ .
Then at the end of the flow you would only need 1 change block to set the score of the request object!
(You can also choose to pass the decimal as output and do the change of the request object in the microflow 1 level above this one)
I hope this helps!