Well I looked at the wiring (before trying to mod it), and this is just plain weird....The socket was ALREADY wired for a 3A3 despite the set coming with a 3DS3 in it! It's like someone tried the mod I had in mind then put a GE 3DS3 tube in as a later replacement or something. The two tubes have incompatible heater wiring....So the 3DS3 must not have had any heater voltage and yet it was allowing 10KV to pass. It was wired with the filament winding connected to pins 3 and 7 (7 being the CRT and focus divider connection point) with a series filament limiting resistor between pins 2 and 3. Oddly enough it must either be factory or a replacement socket since there is no evidence of the other socket pins being soldered.
I plugged in a 3A3 since the wiring was right and got the 22KV I was looking for.
I'm now tempted to rewire the heater circuit to take either tube, and see if the 3DS3 will work right with actual heater voltage.
Here are the datasheets for the tubes incase someone wants to know the differences in heater wiring.
http://frank.pocnet.net/sheets/127/3/3A3.pdf
http://frank.pocnet.net/sheets/135/3/3DS3.pdf
I feel like something or somebody somewhere is playing a trick on me, but feel better knowing than I did when I was in the dark.