So, I got top XP for the moment, but I am pretty sure Tinker can up my score by a lot.
http://images.akamai.steamusercontent.c ... E89C408F2/I prepped Whurrgarbl and Elite Items and know what, Yendor is gone. There's still Zot (though I didn't use it). Also, I didn't know there will be Wicked Guitar (shop is so far away from starting point and blocked by many mobs along the way), by the time I started to use it, I had already killed many of the mobs.
Anyway, I am thinking, with Zot and Wicked Guitar (and JJ to boost stats to even more insane levels for a character which is already inherently strong: Gnome Sorc, yeah, somebody's favourite), you can probably get more XP than from a Yendor. GG and Humility could give more bonus XP but seeing that there's B2P and Halpmeh (at least with Extra Glyphs), JJ might actually be better for more ridiculous XP from higher level kills.
[Oh, and remember to convert Patches if you prep him. I reminded myself to do it but forgot. Luckily, I was only mana-burned when I dinged to 2. Don't make yourself cry by getting screwed by Patches, you know, when he teleports you to a deadend.]