Oracle taking 3 times more disk spaces than MySQL for BLOBs?

Hello there,
We have been migrating one big about 8 TB MySQL table into Oracle 11g R2. The table contains biometric data in 18 BLOB columns - it's a kind of storage table for all biometric information in the form of BLOB. The avg. row length is about 140KB. We had a rough estimation - it might take about 12 TB of disk spaces after migrating the thing into Oracle. We planned to put this table in a 32K bock size tablespace. The table contains about 85 million records.
After we finished loading the data, we discovered that about 20 millions of records already consumed more than 7 TB of disk spaces! In this fashion, we might end up with consuming 30TB of disk spaces after loading the 85 million of records. The only thing at this moment I am thinking about is to reduce the PCTFREE parameter to 2% instead of 10% - the records will be very rarely updated. This will save about 2TB of disk spaces from that 30TB, I guess.
On top of your head, do you have any quick thoughts about the possible reasons of such abnormal (?) disk consumption - it is taking about 3 times more disk than MySQL database. What would be the best way to debug the problem - where to look at?
FYI- All the storage parameters of the table has been kept default - just mentioned the tablespace name while created the table. We have been using SQL*Loader with DIRECT mode to load the data.
Thanks for your cooperation!
Regards.

Hi,
We are using the old BLOB - and not compressed yet.
The machine is not remotely accessible, I will get the DDL later on.
FYI, we did not mention any storage option for the table except the tablespace name. Earlier, I looked at the dba_lobs, dba_segments, dba_extents and had the following few information -
* All the blob columns has "initial_extent" 163840 [from dba_segments]
* Block allocation gradually increased, not uniform (extent_id 1 -> blocks 2, ... extent_id 14 -> blocks 32... extent_id 77 -> blocks 256... extent_id 938 -> blocks 2048 [from dba_extents]
* CHUNK is 32768 for all lob segments
* RETENTION is 900
* No value for PCTVERSION
Thanks for your time!

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