I wouldn't worry about the TA and pH until you get the pool filled--any adjusting you do there will just be negated by the additional water while completing your fill. The pH is really okay for now, and the only consequence to the higher TA on filling is that it could possibly cause iron to precipitate out of your well water--but hopefully the softener will take care of that. If you do see that the water turns brownish looking when you add your chlorine, you probably need to add some metal sequestrant (see the "Metals" forum).
4 lbs of CYA seems like a lot for your size pool--what target are you trying to reach?
You can add a little bleach as the pool fills, just to keep it from trying to start a growth of anything until you get your pump on--I would add it slowly in front of the hose and stir it up afterward with something, just to keep it away from your liner. Keep in mind that until you add CYA, you're going to have to dose it daily, probably two or three times, just to keep "some" FC in the water until it's filled all the way up. Once it's filled up, add your CYA (remember that it often takes several days to dissolve and register) and adjust your chlorine levels from there--then you can tackle the pH/TA issue.
Kudos on doing your homework--it will really payoff to start the pool off right from the get-go!
Janet
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