Then you got your answer... not using a buffer means you're relying on the regulator for flow, the regulator orifice is very small and flow is low, you got yourself a lifter not a flipper.
You need a buffer tank to achieve anything close to what you see on videos you've seen.
A better idea would be to enlarge the port orifice on the cylinder and install a QEV on the inlet...all this has been discussed at length on various threads...and I believe on this thread as well...on the first pages there's a schematic