I agree with chopping up the percentages, and I also didn't like the idea of SE hunting as the only way to get T4.
I think reducing WH and Reno to 1%, adding a chest to Ares with 1% and possible a chest in glow and vault 15 with 0.5%. That way there's still the same percentage chance of rare items spawning, just in various area. Glow and vault 15 are just ideas, as long as there are NPC guards for the chest, you could even cut up that last % even further and make a 0.2% chance for special stuff to spawn in reno sewers, warehouse basement, vault 15, glow and mariposa (or wherever).
So long as there are guards and it is a PvP enabled zone it shouldn't be abusable right?
Just my thoughts, I am very happy that T4 can be gained from PvP activities (reno, WH), but I agree that it has centered a lot of the server's PvP to these locations, which means that the big pvp teams are usually there, or on their way between the two locations. I think adding more locations just gives more people a chance at getting to the loot, while still providing at least 3 great PvP locations (the 1% spots), and also distinct separations between the locations, with Ares being the most dangerous, having so many mutant spawns and reno being the "easiest" with only 3 slags.