Good news about the booking class. The luggage allowance enhancement is quite unfortunate...
For those wondering about offers made for flights after this cutoff date:
Only for offers that have been distributed to Lufthansa on or before 26 March 2017: An additional free checked bag
...
For offers made after 26 March 2017 the free baggage allowance corresponds to the free baggage allowance of the original ticket
More info in the
myOffer FAQ on LH.com