I fully understand the frustration of having a machine you don't really get along with. It's so difficult to pick a new machine that operates the way you'd like it to. There's always some kind of compromise to be made: a "good" washer can be endlessly reliable but do terrible things to your clothes or irritate the life out of you; likewise, a "bad" washer can produce fantastic washing but be a headache to keep running!
You'll have to start a list of how you want your new washer to wash, then somehow try and match a new purchase accordingly.
It's worth bearing in mind that Cottons 60C is going to be intense programme whatever machine you pick - after all, it's normally the cycle performance standards are measured against - so it may be wise to look for something that allows you to modify the cycle (e.g. run with higher level rinses, tone down the spin etc).
I wish I was in more of a position to chop and change (or even try) machines!
Of course, if you do fancy venturing into the realm of alternative programmes on the Zanussi, do let us know if it makes a difference. If it doesn't, you have further amunition to say the machine's a wrong'un and best avoided! Not that we're going to twist your arm or anything....