Carbonation Q

Cider
1

So I made my 1st batch of cider or better “apfelwein”. truned out great

I played with the carbonation a bit, and in some bottles it went a bit to high so I pasteurized it at 170 degree in the oven to avoid bottle bombs. Strangely the 1st bottle I just opend after the pasteurising is comply flat.

Anybody had this before?

thanks

2

How are the bottles sealed? Crown caps, corks, screw tops? Were the bottles on their sides or standing up when in the oven?

3

standing up and were sealed with crown caps even after having several of them the carbonation varies

my explanation is it must be different amounts of yest in the bottles