Ill be honest,
Grammodes have a varied rep, I have 1 and he has been mellow, yet one from the same batch 1 of his/her brothers at 2.5" killed a 6" Female Jag....(not mine)
My personal experience is that they are shy when they are new, but as they gain condifence and get comfortable, they can be real sob's....
I will be putting mine in a 210 (6'x2'x30") with a similar sized Trimac, Festae and similar sized Red Texas (Texas x Midas).
I think that your stock may be in trouble......but that's just my opinion....
Good Luck!!!