Chain of Memories Enemy Card Drops Driving Me Crazy...

I've been trying to get 3x of each enemy card (can't use cheats because they give me 98, inlcuding the Boss ones). Now, I have been pretty patient with some of the randomness of the drops, such as they vary between 2 battles in a row to not dropping them in 2-3 hours. I also figured out that the type of enemy card dropped depends on which enemy you defeat last in that particular wave, which helped me quite a bit.

But now, I've been fighting Barrel Spiders continuously for over 3 hours, and they have not dropped one enemy card. I wonder if any of you have suggestions to overcome any further difficulties with this.

Right now, my strategy is as follows:
1) Use Sleeping Darkness map card.
2) Attack the 3 barrels within the small proximity. 2a) Fight the Barrel Spiders
3) Repeat.

If nothing is there, it usually takes me 15 seconds per room. T_T

Edit: v_v... After I decided to take a break from this crazyness and try to get a rare Simba card that probably wasn't going to appear, I got a Simba 0, and the next Barrel Spider I fought, it dropped the enemy card... I don't know what's going on anymore... @_@

 

For barrel spiders, I believe everything is a bit... random. >.>

You just need patience and luck.

Sitting there beating there butts for 3 hours & not getting anything isn't luck. :/

I wouldn't have the patience. xD