The tactical downvote protection seems weak at best.  

To put myself in the position of such a person who would tacticaly downvote, if only **one out of 10** tactical downvotes earns me an upvote then it's worth it. This is bevause a downvote costs me 1 but an upvote gets me 10. If tactical downvoting doesn't achieve even this then I'm not sure why people are even bothering. 

As such I would support removing this restriction for both up and downvotes