I find that TA is a real problem with sucking the oils out of the rubber. With TA, I complete the addition to the mix and immediately immerse the syringe into a cup of water. Run the plunger back and forth to flush, then let it set in the cup with a full barrel loaded with water. Soaking the syringe dilutes the TA and tends to lessen the drying effect (penetration time) of TA. I suspect whats happening is, TA is removing the natural oils created in the vulcanization process of manufacturing the rubber plunger.
Age, rubber compound and frictional forces all tend to play a part in perceiving the proper working of a syringe.
It may be all about trying to prohibit/shorten the amount of time the offending chemical is in contact with the rubber plunger compound.