I have some 6mm shorter tower prototypes on the way from the factory. They should be heree around Monday. There is no need for shorter shocks on the TC6 when you use a different spring perch and lower shock end. You will just have to trim the a arms slightly. The TC6 has excessive up travel, so when using a 3mm shorter shock end and a 1mm shorter spring perch we get the necessary geometry to achieve this. If we go shorter than -6mm we really have to re desing the upper bulkhead clamps, which I have also, but it is a much more expensive solution.
Minh, I got your VM. I will call in a bit.