I have programmed a simple data field that works as an odometer across edge devices. On older ones, eg. the edge520, the font size works well, but since the SDK was updated to support the 530 and 830 and I updated the manifest files to acommodate them, the font size on the new devices has been very small (bottom left corner):

How shall I resolve this? Rebuild the app anew with the new SDK? But then I can't upload it on the same page, as it will detect it's a different file. Or should I format the font size differently only for 530/830?
Thanks for any ideas!