What you did is ok. You removed the potentiometers (used as potential dividers) and directly varied the control and input AC voltages.
What's the input voltage in the test? The cap diode can't work above about 1 Vpp with 0V control voltage.in practice my prototype shows huge (example on 7MHz, I see 3vpp to 600mvpp as I tune the phase potentiometer).
I use a 10:1 probe at the output of the phaser and a 1:1 probe (a coaxial cable) to ptobe the 50R output of the generator. The output voltage of the generator is 300mv to 380mv depended on how I set the phase potentiometer in the phaser. I do not know why there is this interaction.What's the input voltage in the test? The cap diode can't work above about 1 Vpp with 0V control voltage.
1:1 probe has about 70 pF input capacitance, considerably reducing the phase control range. You should at least use 10:1 probe.