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What are your other "baddies" and how many?
I have seen in the past where a person has 6 baddies and gets "one" removed and doesn't see a score change because they still have the others. Not sure is this is your case as I don't know what you others are?
I had 2 mortgage companies reporting several 30-60 day lates, I managed to get 2 reports to remove the 1 mortgage company's lates, I saw zero change.
The reason your score didn't change is due to the presence of other negative information either as recent or as severe on your CR even following the removal of the one you posted about.
Removing a single collection, while nice, has little to no value if the report is tainted with more negative info. Your CO is actually not that heavy as it has been cooling off for a year. To have a massive positive change you need to actually remove info that is massively effecting your score. The last time I removed a collection from my reports it gave me a chunk of points immediately(~30-40) and over the next few months added more(~20-25) but these were recent-ish when I worked on them and were the only negatives. There are penalties for having negatives of any kind, having negatives per a category, and having a negative. Obviously having the first negative will hurt the most as you hit all three categories but the second one will not hurt as much. Work on talking with your other lenders on cleaning up and the score will recover based on a curve, not a straight line. Also if that collection account's original account has lates reporting then they will ironically be heavier than the collection.