Hi and welcome, Katy! I think twin boys are the cutest (I would have loved twin boys too!)
Clomid is best. The thing is, we get good results for pink with Clomid but that is with a lot of OTHER pink sway tactics. Just Clomid alone is barely pink friendly, in studies it showed only about 3% more girls conceived and I believe if you did a blue sway otherwise, you'd up your odds of both twins and boys.
I am not a huge fan of soy as I don't think it works. If there's any way to get Clomid (and you can buy it over the counter in Spain if you ever go there on holiday) I would do Clomid plus eat an HE Diet and some other easy tricks we have to up odds of conceiving boys.
Why are you not on multivitamins?? I would have you on a good multivitamin like Women's One A Day (the orange kind) and then drop the extra iron (unless you need it for anemia). We've had great results with multivitamins for boys. I got my last two boys taking that Women's One a Day, and one was actually twins but unfortunately only one made it.
I'd also have you on 2000 mcg of folic acid or folate as that may help both twins to survive.
How much fish oil?

