Hi Cristian,
if you HAVE to use the Interactive Interface and it is not possible to increase the journal, you might consider getting the ino:id’s of your documents first and then try deletion of half of the documents with restriction by highest ino:id you want to delete.
(I’m sure that you would simply undefine and redefine your doctype, if you just want to clean it! 
Maybe one of the tools provided in the download area here can do the job without counting ino:id’s!
Otherwise I would propose a minimal program that opens “small” transactions - say, deleting 100 documents in one transaction…
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