The techt bolt reduces pressure by decreasing the volume by using a tophat (the grey looking ring near the back). Since PV=nRT, the pressure is indirectly related to volume so less volume = more pressure and vice versa.
A QEV (quick exhaust valve) is a type of pneumatic fitting that will allow air to escape quicker than going through air hoses. Imagine blowing air through a straw with your mouth. Rather than having to blow the air through such a tiny passage way, switch to breathing out to your nose. The air will come out faster through your nose than it would a thin straw. This is basically how a QEV works. It relieves the internal pressure quicker than letting the air travel through a hose then out to the atmosphere. The older PMRs would dump the air straight out to the atmosphere while the newer ones use a hose system similar to an Ion's hose system.
I really don't know if a QEV would solve your issue. I would try first cleaning off the old bolt entirely (remember to unscrew the can and take the actual bolt out). Clean off every surface you can see with q-tips and cotton rags. Try not to leave any pieces of cotton off the q-tips. Now lube the stock bolt according to your manual
using a dow 33 based lube such as dye slick, PE sl33k, or a generic brand. Dow 33 will be a smooth lube that will not swell orings. Find some videos
. Manual says to coat all surfaces with lube. Use tiny amounts, it goes a long way. Now assemble everything back together.
Don't change any board settings yet!
We need to test things one at a time to find the issue. Put everything back together and try to shoot. Make sure you have enough air. Check your reg, (if you have the hyper3) put the screw somewhere in between all the way out and all the way in, I don't remember the rule of thumb for how it should be set. Try to shoot.
Reset board by setting everything back to the stock values. Try shooting again. Check the connections on the board. Battery making good contact? Solenoid harness in all the way?
If you can get the gun working again, try cleaning and relubing the techt bolt. Put it back in and see how the gun works. If you just had it working with the stock bolt and now with the techt is doesn't, the bolt may be busted somehow. Check the orings on it. Look for any that look worn or slightly shredded. Ideally you should replace all of the orings just incase but looking for any busted or loose orings may be helpful first. Also, do that for the stock bolt too before you install it, just incase.
Anything beyond this is probably an electrical issue, either the board not supplying enough current or the solenoid sticking or busted. I'm not too sure if the solenoid can be service. You may want to call Dye to see if they can fix it. If the gun is still under warranty, it may be free. It may be free even if not under warranty. They built the thing, ask them.