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I mainly watch oldschool OVAs, but I see you've dabbed in them a little bit so I think I can help for your search for gems. I compared our lists and picked out my unique titles you might be interested in
11-nin Iru!
3x3 eyes
Kite
Mezzo Forte
Bubblegum Crisis/ Ad Police
Afro Samurai
Ajin
Alien 9
Angel Cop
Angel Densetsu
Blue Submarine No. 6
Appleseed(I've only seen the OVAs, but apparently the first movie is pretty good to.)
Area 88(OVA)
Armitage III
Arslen Senki (OVA if you liked the TV series you should give it a try)
Aura Battler Dunbine ( If you liked the original Gundam this might interest you. Not for everyone though.)
Babel II OVA
Baoh
Bastard!!
Battle Royal High School
Black Jack OVA/Movie
Black Magic M-66
Please Save My Earth
Video Girl Ai
California Crisis
Call Me Tonight
Crusher Joe movie/OVA
Crying Freeman
Cyber City Oedo 808
Dead Leaves OVA
Devilman OVA
Devilman Lady TV series
Dirty Pair: Project Eden (good place to start with the franchise if you have any interest)
Dominion Tank Police
El Hazard: The Magnificent World
Giant Robo: The day The earth Stood Still
Night on the Galactic Railroad
Golgo 13
Green Legend Ran
Grey Digital Target
Gunslinger Girl
Gunsmith Cats
Riding Bean
Hello Hedgehog: Domain of Murder
Eden of the East
Blazing Transfer Student
Iria: Zeiram The Animation
Karas
A Wind named Amnesia
Kekko Kamen
Key the Metal Idol
KO Beast
Guyver
Vampire Princess Miyu OVA
Lily C.A.T.
Record of Lodoss War OVA
Super Dimension Fortress Macross
Mad Bull 34
Megazone 23
Midnight Eye: Gokuu
Mitchiko and Hatchin
Mermaid's Scar
Patlabor
Moldiver
Outlanders
Otaku No Video
Paprika
Petshop of Horrors
Plastic Little
Robot Carnival
Roujin Z
Revolutionary Girl Utena
Shin Cutey Honey
Twilight Of The Dark Master
MD Geist
Sol Bianca
Soul Eater
Space Adventure Cobra the Movie
Street Fighter II: The Movie
Sukeban Deka
Summer Wars
Melancholy of haruhi suzumiya
Tenchi Muyo
Birdy The Mighty
Maris the Chojo
Tokyo Godfathers
Gunbuster