Jacob:
"After some tweaking (and using the values I have around) I've settled on 2k ohm R17-R18 and 1k in series with the pot. I'm using a 20k pot but the usable range wouldn't be much less with 5k."
Marc:
"My recommendation was R17, R18 = 10K and a 20K pot with a 3.3K series resistor. The two 5K resistors at the feedback point are also changed to 2K"
digger945:
"1K pot, 1K for series resistor (R62) and 2.2K for R17-R18"
Kevin:
"One other thing, i forgot to mention is the 5k resistors are now actually 2k on my prototype so as to match the gain between the two different feedback types."
Heh, clear as mud.