Unseating dual tubing hanger with 3-1/2" ITCO spear (Mcevoy platform wellhead system)

07 July 2018 We are currently trying to recover completion in preparation for reservoir abandonment.
We have made multiple attempts using 3-1/2" ITCO spear to unseat tubing hanger with dual 3-1/2" tubing strings cut deep below at ~8,950ft MDBRT.
1st attempt - Engaged short string tubing & took straight pull to 340klbs MD (~80% tensile limit for spear) - lost the grapple.
2nd attempt - Engaged short string tubing & took straight pull to 200klbs MD - lost the grapple.
3rd attempt - With 4-3/4" fishing jar incorporated in the BHA. Engaged long string tubing, repeated cycles of jarring at max load 95klbs and straight pull to 315klbs MD - no movement. Released spear, POOH and inspected BHA - spear mandrel and grapple in good condition.
4th attempt - With 4-3/4" fishing jar incorporated in the BHA. Engaged long string tubing, repeated cycles of jarring at max load 95klbs and straight pull to 340klbs MD - no movement. All tubing hanger tie down bolts confirmed to be fully retracted - they have been serviced multiple times and confirmed to be intact.

Any thought or suggestion on what can be done differently would be highly appreciated. Thanks in advance.

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