In our humble opinion, B31.3 contradicts itself here. Our interpretation for V13 is: if B31J is activated, then use the B31J SIFs and SSIs and NOT the 0.75i value. However, since the release of V13 a number of users have questioned this decision.

For V14, we are re-enabling the "0.75 Configuration Directive" you discuss above, even if B31J is activated.

(We were hoping the 2022 Edition cleaned this up, but that didn't happen.)