Okay this is weird. I did nothing different this time, but just now, I started getting 9000+ points for 3 timed bombed candies, and now easily get to 100.000+ scores two times in a row. I'll probably still need several tries before getting to 300.000, but I'm scoring significantly more points per move all of a sudden.…
Thanks for these answers @kiara_wael and @wykoon . In the meantime I've had a color bomb booster which I activated before the level. I've had 2 more color bombs and combined a striped candy with a wrapped candy in the upper part of the board. All blockers broken. And with a little "help" from the game at the end producing…