Did MPE+ provide you with any results? Unfortunately, it is not a preferred tool so I cannot really comment much on it. It may well be that the deleted SMS have since been overwritten or/and the creation of a new SMS.db has occurred, as the old version has become unstable. This could be why not many entries were recovered.
Alternatively, if you search this forum there are plenty of threads that discuss recovery of deleted data from these sorts of db files. Including Sanderson Forensics software and even IEF which I have used numerous times.
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