I GUESS you do the ahmatw from your weak foot and end it with weak foot
so therefor you should probably get more stabile at the last rev, like you practice your wf
I pretty much struggled with this problem aswell, it helped me to practice my hmatw quit a lot
and when you get stabile enough at that you shall be able to pull of ahmatw
and you can always train your wf in other ways to make it stronger ( htw -atw -hatw-htw , kamatw , co amatw nt )
if this seem to not be your problem, it is your first hhtw which is to slow
you can make the ahmatw higher and you will have more time, and if lower much faster
you will figure out this on your own..
good luck!