Yet another question regarding closed spark tables

[exrn]

Bike is a 2010 Ultra Classic, V&H Monster Ovals, Big Sucker, and Fuel Moto Jackpot 2:1:2 headers. After 18 months and 20K miles since my last TTS tune, I decided to check and possibly tweak the tuning. All went well. However, since installing the Monster Ovals, I have always had a slight pop/burble at 1700-2k rpm, about 30kpa, and I decided to investigate this time around. It is most obvious when in first under no load when decelerating, or easing through a 25mph area. So on searching the forum, I find a few entries discussing closed spark tables. These seem to indicate that, and I quote an example, "make the 15-kpa tables match say from 0-2k rpm, and make that match your closed spark tables". I have some questions:
Baseline Cal is CTC009-03-0A
Changing the main spark tables say 0-2k rpm, how does one decide what value to set these to?. As a default, these vary so to set them all to a set value one needs to know what that value would be for one's bike. 22*, or 27", or what?. One could run a spark recording, but what am I looking for?. What is the advance at certain kpas?.
Are these values the same for both front and rear cylinders?.
Close spark tables are like a few tables, based on engine temperature *C. Do I change all cells to be the same, both for front and rear?.
If these tables are based on *C, and only go to 48*, a warmed up bike would be 112*C and up, so what is the significance of these tables regarding temperature. A few tables are like this, and I have always been confused as to why they end at 48*.
As a another question, why not have a properties setting to show tables for *F and not *C?. Probably a Steve question.
Thanks for any input.

[hrdtail78]

What ever value is in the last cell. 48c will carry on out.  This is the same for the other tables that do this as well. 

[exrn]

That makes sense. Thanks.