no that mantra is very good but do 1080 everyday.
havan is making obilgations to agni or the scared fire every time you say the mantra you have to do ten % of it in havan.
example if you do 1080 mantras you need to offer ten percent of that in havan which is 108 mantra.
sri aurobindo - kala bhairava is ista devata, chamunda devi
sri ram - hanuman devata,durga devi