Did you use sensor drying on your “ancient dryer” or a timed program? If timed, that might well explain the difference in drying performance. Although it may not be drying so thoroughly, your new dryer should be using less energy.
Three observations that may be relevant (1) duvets are best buttoned up before washing and drying to stop them swallowing other items which can impair spinning and drying (2) to achieve a higher energy efficiency rating, modern sensor dryers are calibrated to achieve the bare minimum level of drying permitted by the test. Drying settings on some brands, notably Bosch/Siemens, can be fine tuned through the settings menu, so it’s worth checking the user manual to see if that’s possible on your Blomberg (3) when fabrics are hot they feel damper than they really are – shake out to cool and they quickly feel much dryer.