Systems are similar. Until you play a certain number of games IN EACH RATING AREA, there will be large swings in Ratings when you win or lose, until you hit whatever number of games when things "slow" down for THAT RATING AREA.
For example, you can play 100+ games in Standard chess and your Rating fluctuates slowly each game. However when you first try Blitz chess, each game, win or lose has a big affect on your Rating.
That is also true of the Tactics Trainer.
Simple (and probably stupid) question:
Why are so many more points on offer in online games than live? I won literally 3 games online and saw my rating go up by more than 200 points, whereas live games only carry 7 points on average. The opponents' ratings are similar in range between the two types of fixture in my settings, so that can't be the explanation. Short of winning a hundred games on the bounce, how is it even possible to significantly improve your live chess rating under this system?