thats not how store tp works.
Store TP is after you USE a WS.. it 'saves' a set amount. in this case it save +8 more tp than it normally would.
If you want to test this.. take the gear off.. figh an easy mob.
USe the ws .. find out how much tp you START with AFTER you use the WS.
Put the gear back on... use the WS again.. you should START with +8 tp compared to what you did with the gear off
Do not listen to this person. You may be talking about conserve TP (having been out of the game for a long time, I'm not sure about the mechanics of it), but that is certainly not how store TP works.
Edit: I feel I should link to a thread that explains how it works properly, but alas, I don't know of any off-hand.