Hi there, I have 2 drilling quotes in front of me for 900 feet (3x300) of bore hole. The difference between the two is that one driller is using 20% bentonite grout (around 0.43 thermal conductivity) and the other is using an "enhanced" grout with a conductivity of 0.88. The ground in my area has a conductivity of around 1.4. Is there going to be a significant difference in system performance with the 2 different grouts? I'm baffled. thanks!