one of the problems is the clock gltich or lack there of on some glitchers, on later cards clock glitch was completely ineffective.
A decent clock delivered around the vcc glitch was very efective for rom10's and not needed for rom11's. The old Ubomb that first became popular for A86's actually had the mechanism still in place
. Many of the T911's knocking about seem to have a chip left in the device that should actually have been removed, I pulled said chip when i realised it was inhibiting the clock glitch - i then proceeded to change all the smd chips for HC type (they are full of HCT) i then ended up with a T911 that gltiches like a powersync lol.
Upshot if your T911 has the chip present then it cannot clock gltich, look at the pcb is there pads for a chip that has not been mounted?
When the chip was present inhibiting the clock glitch the pot is very sluggish, no need for multiturn types and the dips also are not functioning as was intended. When the clock gltich is snapping at the heels of the vcc glitch then the pot becomes vibrant in its effectiveness due to the involuntary clocking - these required then a multiturn pot then changed rapidly with small movements as is descriptive of a powersync pot.
This is why some gltichers such as nexus and a number of T911's do not have the multiturn trim pot, becuase they are not clock gltiching as well as vcc glitching.
Nagra2 onwards use internal clocks, so clock gltiches are useless of course