Hi Ron,
I suggest an alternative, for discussion purposes only.
I have not used the L3914 before so this might not work.
The power supply LM317 is similar to yours and outputting 15V. I would then setup the LM3914 to gives a 10V reference voltage, with RLO grounded. So the scale for SIG input becomes 0-10V for 10 LEDs.
I'll then use a TL431 to drop a constant 20V from the input signal before feeding this to the LM3914 SIG input.
The first LED will light at 21V and the last at 30V, giving a one volt step per LED.
Do you think this will work?