The following is a table showing the percentage chance for hits and crits on each die rolled.
Modification |None |Focus|T. Lock|F+TL
Crit Chance |12.5%|12.5%|18.75%|15.625%
Hit Chance |37.5%|62.5%|56.25%|78.125%
Total Chance|50% |75% |75% |93.75%
Note: The Crit% for T.Lock assumes both focus and blank results are bring rerolled. The Crit% for F+TL assumes only blank results are being rerolled.
Now getting a Focus and/or a TL cost 1 action each to obtain barring special circumstances and anything which grants you an additional action is going to cost you points. Even in those circumstances the ability used still costs you in points. Now your first action, which ever it may be, will increase your total chance per die for either a hit or crit by 50% from it's base chance. Your second action will experience a diminished return only improving an additional 25% on the already boosted roll. As such I suspect trying to get the second action may be a waste of points. The 75% chance for a hit or crit result may be more efficient in points than attempting to further modify the roll.
What do you guys think?