I'm still not clear on what exactly you have in the 10 QT for filtration, but I'm assuming you have something that bacteria can populate. If that's the case, honestly... you're looking at something around 4-6 weeks for a tank to cycle. It doesn't sound like you ever cycled your QT and that's how long it normally takes to go from start to finish. Luck isn't going to be on your side. Sorry.
You're probably going to need to do 20% water changes, twice a day, for several weeks. If your PWC
water is EXACTLY the same pH/temp/salinity as your QT water, then I'd probably do 30% changes until your can get that ammonia number down. 1.0ppm is pretty high.
Are you testing for nitrites too? Those will most likely start showing up later this week if they haven't already. Those, I think, are actually worse for the fish.
It's a catch-22. Those things (ammonia and nitrites) and bad for the fish, and you need to do water changes to keep those levels down. But by doing water changes, you reduce the levels of ammonia and nitrites that you need to properly establish a bacterial population to deal with those compounds. So you end up making the cycle go longer and longer. That's why it's so important to cycle a tank when nothing is in it - so you don't have to worry about doing constant water changes to keep something alive.
You can always use a chemical product to detoxify the ammonia (Seachem's Prime, API's Ammo-Lock, Amquel, etc) but having never used those for that reason, I can't help you there. What I do know about those products though is that if you use them, you'll still read ammonia using a test kit, even though the product has converted the ammonia to something harmless. And again, without the ammonia, you're not going to progress at all with cycling the tank.
Think water changes are the easiest thing to do at this point. Think I read somewhere that you're a ways from the LFS
, so returning the fish probably isn't going to happen.