Bulk. I've made an addition to the silver elf lore to clarify and stop more hulk elves running around - it's just not what was meant to happen with them, it's not what the lore is about. You made your character profile April 2014, the current Silver Elf lore was posted late August 2014 (I could dig for the old stuff but there's not much point). Two ways of looking at it; 2 years of going against the race lore (eh), or, 2 years where staff should have pulled you up but haven't (I'm assuming you haven't been spoken to about this before?), which is shit for you. As you've said, you've put time and effort into your character, and appreciate that.
At 6'1, with a build that only supports a lean, lithe frame - even with exercise and training, I'd be maxing a silver elf out at 175 lbs. Muscular and toned yes, bulky no. This is what I'll be enforcing in general. Sif is currently sitting at 245 lbs; big dude. Very big dude. What I'm asking is for you to meet me just under halfway - 215lbs and we declare Sif a special legacy lore exception. 215lbs is still large, it's still strong, and still much bigger than what I would and will accept for a silver elf. Does that sound okay?