T3 ajustment is simple.
Take action out of stock, you will see the ajustment grub screw thats paralell with barrel in trigger housing, unscrew / ajust thjis to suit your requirements.
Making sure of course the units sear engagement is not affected by light ajustment making the rifle unsafe.
The screw will only undo so far when it then fouls with the retention bolt.
Suggest you leave the ajustment screw at least one full turn in from touching this bolt.
Most tikkas have loevly triggers - even the T3's....