[traveller (Bo)]

Need some advice on stacking.
I did a couple of imaging runs of 47 Tuc recently. The first batch was done in late Nov had the target centred nicely, but the latest batch done on new years night did not have the target centred (it was at approx 7 o'clock position).
I tried to stack them but the new batch got rejected as I assume the target was way off for the images to be plate solved adequately.
My next attempt is to manually resize the latest batch to place the target in the centre so they can be recognised and stacked. So here are some questions I hope someone can answer:
1. Will this approach work? I would assume so, but not for certain.
2. Once I re-centred my latest batch, the file size will be smaller. Will that affect the stacking?
3. What format should I save my re-centred files? (currently in Canon Raw file, the late Nov batch is also in CR format)
Thanks!
Bo