Printing presets on pages

My company recently got a new iMac. We had an iMac before, but it was about 10 years old. 

On the old iMac we had no problems printing, and setting up printing presets (specifically through Pages). But for some reason those presets and setting up new presets aren’t working correctly on the new iMac. 

So here’s the 2 problems I’m having with printing (from Pages, on iMac). 

I want to print 2 A4 pages onto an A3 piece of paper.

On the old iMac, I set this up as a printing preset. I set number of pages per paper as 2, then set the printer page size to A3. And then I saved that as a preset. 

So then any document I wanted in this format, all I had to do was select the preset. Simple. 

But the new iMac is having 2 problems. 

The first is when I set up the settings as above, and save the presets, the next time I select that preset, it defaults to A4, even though I saved the preset to A3. (Note, I’ve already changed the printer settings in the iMac settings to default to A3, but that doesn’t affect it for some reason). 

It doesn’t matter how many times I save the A3 setting preset, it just doesn’t do it when I select. Everything else changes to the preset settings, except the page size (I think it’s under paper handling, scale to fit, A3). 

The second problem is that, even if I do it manually, and select A3, when it prints, it prints on A3, but it shrinks each A4 by about 30-40%, so they aren’t filling up the whole page. I can’t see any option to change this anywhere in the Pages print options, so why on earth is this happening and how do I stop it? 

Please help me because this is driving me crazy. 

All apple support stuff seems to imply that page size will be saved by presets but it doesn’t seem to be the case for me. What gives?