Dura Ace 7900 front derailleur issues

im upgrading from 7800 to 7900 and after installing the cable into the FD im having shifting issues. If i tension the cable the downshift from big to small seems quite 'agressive'. If i loosen it so there is a bit of slack in the cable, the downshift is better but i loose the trim function in the small ring..all limit screws are correctly set up. anyone had this problem?

thanks

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