Finecut problems

We have a powermax 1100 with the rt80m machine torch. it's on our torchmate and it's been working fine. I bought the finecut consumables kit for a job I'm cutting out of 10 and 16 gauge. I tried cutting a test piece our of 10ga, the thc went down came up to pierce height and then fired but that was it a couple sparks and it pierced maybe half way through and then nothing. I put in the 40A consumables that i've been using for 10ga and it works fine. Any ideas?

Thanks