I actually mentioned the issues with Maher in another thread a few days ago ..
When choosing a kicker before a season I would focus on mechanics and of course accuracy history. If the kicker has solid mechanics, you can tweak accuracy if they are a little off.
Maher seems quite accurate when his mechanics are solid, but like a lot of athletes do, he alters his mechanics sometimes when power is not needed. It's just like some baseball players will drop their shoulder to hit of the opposite field or quarterbacks will not set their feet sometimes when throwing a short pass. Its just more noticeable for a kicker since they get so few opportunities each game and their field goals usually have a bigger impact.
At this point, I think Maher has been a good kicker and they should stick with him. I think the special teams coach just needs to harp on using the same mechanics every kick no matter the distance.