Oven temperature when increase bread recipe?
You need to increase something and time is the easiest:  for 50% more weight add 50% more time is the rule of thumb for an increase up to 100%.

You can also increase both temperature and time but then you should halve each so 25% hotter and 25% longer.

Note: This works up to an increase of 100%. Larger than that, volume calculations come into place too.