strings that can handle being tuned higher than standard without breaking

[Dok]

Hi,

I'm using a tuning on my guitar that requires the 1st and 4th strings (E and D, respectively) to be tuned up a whole step each. So F# and E. Most sets of nylon strings I've tried will hold that for a while but eventually I'll pick up the guitar in the morning to find that the 4th string (the wound D that's tuned up to E) snapped overnight from the extra tension.

Any recommendations for a classical/nylon string set that can hold this amount of tension better? Bonus points for ball-end strings (yes I'm lazy, sorry) but not strictly necessary if I don't have to replace broken strings all the time. Thank you!

[CoastStrings]

I would instead recommend that you tune the other 4 strings down a step and then capo the guitar.