Just like that, you're in the home stretch and down to the final 5 levels of the pack. If I'm not mistaken, the level you're currently on was the one that stumped me the longest out of all the other levels in the pack. If it's not 16, for sure it's the next one, 17. Indeed, despite being a 1 of everything level AND a 1 minute level, Tricky Quicky is very aptly named! Similar to It's Hero Time from the original lemmings, 1 of everything AND also 1 minute.
If it is 16, this all reminds me of the situation I was in about 2 weeks ago: down to the final 5 levels of the main part of United, with the first one of the bunch supposedly the hardest level of the entire pack. I ended up solving it earlier in the week, and TBT I didn't think it was THAT hard. Then again, I do have a skill leftover and so it might be a backroute. Now, almost a year after I first started playing the pack, I'm on the final level of the main pack (I still have the Bonus rank to do). I have yet to make any serious attempts at it, but let's see how long it will stump me.
Let's motivate one another to finish the pack we're currently playing through. You can do this! Besides Tricky Quicky, once I got past that, unless the Superlemmini levels got replaced with new levels for the NL version, I recall the remaining levels weren't super difficult.