I run an AUM bottom end on my k04 golf and its weaker than a BAM bottom end apparently, but good for 280hp and but more than 290lb ft of torque. I'm running 1.33 bar overboost spike and 1.1 bar (roughly) held to redline so i'm just within the safe limit, but it's a grey area as not many AUMs have run k04's. Theres a chap on uk-mkivs that blew his bottom end running a k04 at boost pressures just a little over mine.
Strongest bottom end to use would be the AGU or any of the 225 bottom ends if you have the option of a new one.
Keep me posted, would like to see where and how much you get your bottom end from / for