You can't just say that and then not explain why. Admittedly, it's a good hint.Ordray
That formula is completely wrong. Attacking ghouls has nothing at all to do with the conversion rate.
Usually conversion rate (as I've noticed) depends on how close their NW is to your own, which has to be 5% higher or lower than your own. ALSO it depends on how many Specs you send (somewhat). Usually if I send more than 3k specs, I get about 600 converstion. Over that, it looks like it caps out about 850. (if you are within 5k higher or lower) Take note that this won't happen if the province you attack has been heavily hit. The conversion rate is far lower than it would be normally.
I would guess it's 15% of your total specs, despite how many elites you send, as long as the province you're hitting hasn't been hit lately. The % looks funny at times, because of the fact that I think it caps out around there. So I suspect its a percentage of that cap. That's the most you can really hope for (850). I haven't seen anyone get over 900, personally. Would be nice to get further input on that.