Stats like TFLs and INTs don't necessarily mean that much when it comes to the NFL draft. Those stats are highly dependent on factors beyond the player's control. For example, some defensive schemes blitz their LBs far more often then others. The more you blitz, the better your TFL numbers will look. INTs may depend a lot on whether you're normally playing zone or man, who you're defending, and whether your teammates are near the same caliber such that opposing teams simply don't look to your side of the field.
Physical attributes and reviewing the tape to see how well you can handle your personal assignments are much more important than statistical output of TFLs and INTs.