It's game mechanics issue - let me explain.
Each planet buying or selling spices, can get non-default price (which is cheapest one) only on one (on rare occasions two-three) types of spice. Before it was OK, because there were too little number of spices. Now, with over 50 spices, it's just spread so much, you have trouble finding good price.
Let me give you quick example - you got spice in your cargo, and you come to a planet. The planet requirement for spice makes it so it requires one spice out of 50 (or something like that, didn't count the exact number) possible. So your chance to get good (or decent) price is actually 1 out of 50, which is 2%. What you can do, is just carry around 10-20 different spices in your cargo, thus increasing chances for having good price for at least one of them. IMO, it makes trading a little hardcore, but more interesting. And also, since I added unique price for each of spices, you can never know, if what you get is good deal or no, making it all the more interesting.
EDIT: Started playing again - discovered a couple typo errors, and two missing descriptions (No idea, how I could overlook them the first time I added descriptions). Also, due to the increasing difficulty of trading(mentioned above), I don't think adding more spices in the future is good. I would say, that with this mod, we have enough. New version attached.
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