Masked attack ?

Consider this scenario:

Password between 8-14 characters.

I know the first 3 letters exact, i know there's only uppercase TL (exact) in it, it may be TLLT LTTL or just TL/LT, i know there's only the numbers 3, 7 ,1 in use (after the letters) i just don't know the exact combination.

Can someone help me think of a way to better convert this process into hashcat if possible? I basically know the whole password, i just can't find the right combination.

Sorry, i'm kind of a newb, i'm getting an hash from a .7z file encrypted with AES.
use custom charsets for example:

Known TL within password & 371
Define the custom charsets using -1 thru to -4

-1 TL371

Create your mask attack with increment upto 14 from 8
Add in your known 3 letters at the start (ABC in this example)

hashcat -a 0 -m (hashtype) -i --increment-min 8 --increment-max 14 hashfile.txt ABC?1?1?1?1?1?1?1?1?1?1?1