Same issue. After adjusting everything 10x and still having the seat not open, I put a small ziptie on the cable under the seat by the lock. Just a small loop big enough for two fingers. Turn the lock, pull the ziptie and bingo. works every time. Yes, kind of ghetto, but you can't see the ziptie unless you look under the seat.
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1997 Ducati 748 Biposto
2002 MV Agusta F4 Evo2 1+1
2009 Ducati 848 White
1986 Honda VFR (Sold)