Well, I checked the Introduction page, the FAQ, the test server rules in RMS page and the forum itself, but I couldn't find if changing the test server game mechanics is out of question. So, here I am.
By checking things like max job level, base level and stats you can see the test server is made to support builds ranging from low to super high rates servers. The thing is that most of the high rate servers I play (and some of yours probably too) use 195 as maximum ASPD, instead of 190 and that 5 points make a huge difference. The result: build testing becomes a lot innacurate. So, my suggestion is (if changes to the mechanics are possible) putting 195 as maximum ASPD.
Also, I saw some customs like the Ahura Mazda in the server. So, another suggestion is making some (3) customs headgears with higher number of slots. That's something very common in high rates too and helps testing things like the effect of multiple Kiels.