Which strategy did you use? The easiest way to get the mobs to spawn was to literally fight -everything- in the tunnels. Some people said that honky-tonkers (or whichever) were rare in other packs, but I disagree. I found them more often through other packs than solo. I probably only found a couple on the actual screen and I wasn't always able to get a gold glim to appear either.
The strategy I used was fight everything until you find the mob. Make sure Oliver has his oldest wand equipped and Esther and Swaine are set to do nothing while continually defending via the square button. Most of the mobs did not cast many abilities so defending over and over again is tedious. Instead, I would slowly pick off each enemy with Pulse (because it always gives a Nice!) until I was down to the honky-tonker. I'd then run around until he casted an ability on Oliver which I would defend. I'd do a few of those to build up more Nice!s and then slowly whittle his health down with pulse. Sometimes I got golden glims, often I did not. When he had a sliver of health left, I'd switch to Swaine and try stealing it. I don't know if Nice!s increase the chance to steal rare items from the enemy, but it honestly felt that way to me. Before I tried this strategy, I just would try stealing from them. I tried it 6 or 7 times and got crappy stuff. Then, using the mix of pulse+defending the body blow ability, the rate of getting scrolls of truth was high; easily above 50% I'd say. Also chance of getting gold glims was so-so. Maybe got 2 in 10-15 battles, which could be worse. Oliver was level 95 when I did this and his magic stat was so high even with everything I could unequipped and using his lowest wand, he was still around 350 magic. If I was lower level using the pulse trick, I'm somewhat confident I could have gotten more gold glims.
Hope this helps.