1)When Defending, can you use all of your hold at once or is it one at a time? We went with using as much as you wanted at once as it didnt' feel (to me) like a couple of the options made much sense otherwise.
Yes, we play it that way. Spend as much of that hold as you want while defending.
2)When Clerics fail a casting, do they automatically lose the spell too or is this up to the GM as a Golden Opportunity choice? We decided that you do lose it, otherwise you could just keep reattempting it.
Golden opportunity. Having them lose their spell is just Use Up Their Resources
which is fine go-to, but I like my golden opportunities so I can do something more interesting if the fiction has an opening. I like to be as evil as possible with GO's so that any time a 6- gets rolled, the players take notice and cringe.
3)Can Clerics memorize the same spell twice? We've thus far said no.
I don't like the notion of memorizing the same spell more than once, but if someone presses me on it, it's easy enough for me to not care if it means a lot to the player. They're essentially giving up versatility in favor of failure mitigation which is less interesting in my opinion. To each their own.
4)Can you lose your Rotes the same as other spells, upon failure?
I don't ask for a roll on Rotes or Cantrips. Maybe I should, but it doesn't come up enough for me to see anything abused.
5)After poison has been applied to a weapon, is it used up with one strike or is that another GM move option for weak hits and failures (deplete their resources).
We say it's off the weapon once you've gotten a hit in. But that's an interesting thought. I could see it done either way.
6)Can you Aid/Interfere with someone you have no Bond with? As written, the answer is no but it seemed a little strange.
Wouldn't it just be a straight up 2d6 (Bond 0)?
7)Do you get XPs on a failed Aid/Interfere roll? In the light of day this seems like an obvious yes, but for some reason I questioned this last night. Yes?
Yep. A miss is a miss.
8)You can only get 1 XP per session for resolving bonds. But can you resolve other bonds if you feel like its time to move on and rewrite them, just not get experience beyond the first?
I think you can only resolve one old bond and establish one new bond per session. But I see no good reason to disallow some reshuffling from time to time if the group wants to do that.