well if it doesnt take much time or you can afford downtime I would reorganize it
Your configuration in the long go would just cause fragmentation, one of the customer we have is suffering this, we told their *so-called* DBA to set initial=next pctincrease=0 he was insisting he must set a larger initial for each segment to avoid the increase of number of extents now he is suffering it badly, he has tablespace with size of 8GB and only 3 GB is occupied by real data with 5GB of space unable to be reused because of the funny extent sizes he set