Greatest impact prediction

#1
Hi,

please i have one Question.
If i have this results (Stepwise method)


Can i say:
1) Better for predict Y is model 4
2) Regression equation is: (based on Unstandardized Coefficients B)
Y = 0,27 + 0,476 * F1 + 0,188 * F2 + 0,118 * F4 + 0,138 * F3

BUT
Can i say,
greatest impact on the prediction of the Y has F1 (62,6 %) based on Partial Correlation?

I see a lot of tutorial, but i have some problem with this.

Thank you for your time