New to cracking any help appreciated.

What would be the quickest way to crack a password knowing these things about said password..

Password is: 
12 characters long
First portion is a 5 letter word
Second portion is a 4 letter word
Last portion is 3 numbers ranging 100-999

I have created wordlists for the first 2 portions and use a rule for the last but estimated time to crack is 2 days.

Im unsure how I can narrow my lists or if there is anything I should be using that would be easier.

Example passwords to be cracked are as in the following 2 examples:

StripCoop759
PuntsRock846

Any help appreciated