Party even with my own system I'm very weary when a price limit is needed.
At $11 level I'd go up to $12 to $13 even, if the system requires such precision, given the volatility of the market it's not worth bothering about.
(if it had been proven that it never won over $11 then it's an different matter!!)
With prices at a lower level like $2 to $4 I might consider a 50 cents range.

Just my opinion! If anyone disagrees no problem.