All VFT's clump, it's their nature to reproduce by rhizome division.
Nutrition and lighting plays a large role in this process. Outside my plants feed constantly, most traps are closed with prey. Sometimes the prey is partly outside the traps and they rot, sometimes they don't, but in any event there are so many of them it is not an issue. I generally just let them be, and remove any blackened traps.
I would recommend additional lighting for the Western exposure if you can manage it. These are light loving plants.