Hello, I'm from Holland and I can't write in German

I have a question.. Now i'm playing with Energy X-tra Max on my forehand ,but the Energy X-tra is 'dead', it doesn't give much effect anymore and it has some 'dead' spots on the rubber.. ( I have speedglued it sometimes)
My blade is: Butterfly Schlager Precision ( quite hard)
Now i'm searching a new FH rubber.. I like soft rubbers (I played before with Mambo/Samba speedglued) I liked the Energy X-tra, but the 'haltbarheit' is not good.. What's the best rubber do you think for me?
Is the Stiga Boost TC a lot harder than Energy X-tra, and has it good sound and good effect? Or do you think the Impuls Speed is good for on forehand? I heard good things about it.
And what do you think of the Tibhar Nimbus Soft, i heard it was quite the same as Energy X-tra? Maybe it's more durable? And Joola Express Two, is that a good alternative for the Energy X-tra?
Thanks in advance, and you can answer in German