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Redwolf has a "how GBBs work" write up and details both the TM and WA blowback designs. I can't remember the particulars and am no expert at this stuff by any stretch of the imagination. It's in their reviews/info section.
But by observation and to my understanding, in the TM Hicapa, the FV spring does push the valve to the rear of the unit...opening the flow of gas from the mag to the bb/barrel. A weaker spring would let the valve switch from "vent to barrel" to "vent to piston" sooner (all things such as temperature and pressure remaining the same). A heavier floating valve (made of metal) with a stock spring will also react in the same way, and so needs a stiffer spring installed to balance out the system properly.
Amazing system...in that it works as reliably as it does until you monkey with it!
Personally...I'd reseat the hopup rubber/unit and try it again.
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