Full back tackling and speed

Hi, I have a full back who is full stats for the league level I am in but he always seems slow and poor at tackling. Does anyone have advice for my strategy to improve this. Thanks
You can speed him up by increasing his rhythm and defence speed, but that will make his tackling worse; you can improve his tackling by reducing those, but that will make him go slower. You can't have both.
Will go with the happy medium. Thanks waspy
Have him on low defense speed so he doesn't miss tackles but high Rythm so he runs faster
Thanks Ben, would you do that with the rest of the backs but for attack?
I would...I have all my backs with low defense speed about three quarters full on Rythm and attack speed
Top man, thank you for your help