So, to finish up on this one... I didn't get a chance to try the lower tower yesterday, but I did run with longer Grippas on the rear shocks. The change is quite subtle, but definitely for the best. The car seemed more stable under breaking into corners, and carried speed better through the chicanes, as it seemed to have much better weight transfer; the chassis seemed to be freed up to work properly. I'll definitely be getting the lower tower to play with now.
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