Help with setting up a GroupCheck call

I trying to setup a groupcheck (Fantasy Trip character sheet) which needs to roll 4d6 vs iq and report success or failure, I have this !group-check-config --add { "Perc" : { "name" : "Perception Check", "formula" : "\[4d6 < (\at{iq})\]"} } which looks like it's doing what I ask, it's grabbing the character iq ok, but, it's not reporting successes, if I mouse over the result it shows the above. I thought it might be the spaces either side of the < but if I removew them it just doesn't work. Help for the confused please  :)

Doh! rolling this !group-check-config --add { "Perc" : { "name" : "Perception Check", "formula" : "\[4d6<(\at{iq})\]"} } is working - I just missed that it checks each dice individually so testing with an IQ=10 it always reported '4' which was the number of successes, so now I just need help finding the correct syntax to make the success test look at the total of the die rolls.