[der_RenTneR]

although i don't play tango, i can tell you that this has already been a subject in the message board here. the tango is very fragile in that concern.
on the one hand people say that the tango gets an extra boost from bending it,which by the way, as you guessed right is "strecken" or "spannen", on the other hand they made the experience that then the tango dies a fast death because of the extreme tension. so you have to decide wether you want to have maximum speed or just a rubber that lives longer then some weeks.