Man if my GPU runs at that Temp. I will be very happy.
It is happening because of the non reference non blower design of the MSI fans.
You have no choice but maybe try adding another super rpm fan for in flow on the GPUs.
This is why I am so interested in the liquid cooling, especially when I am planning to add another card later. Because even with the new cpu fans system, just like yours fan system, temp. might not come down below 70.