Hey nic.
If you have a quick look at the start of my journal, you will find I was the same height, at almost the same weight. Your squat and deadlift are higher than mine were, with bench only 5kg down. Both of us tall, skinny, lanky guys.
I can now squat 155kg, bench 107.5, deadlift 220kg, 13 pullups, 22 dips..... That was in 12 months of solid training. I had no clue with diets, so at least your one up on me here. Now im not trying to make myself look strong, just trying to let you see that even though our body types arent ideal, decent lifts can come.
The main area of difference, and the reason I think your not getting the gains you want is the training. You've tried all different things, but not really sticking one out. I took a program off PTC, a member on here, and stick to it for at least 6 months.
Breathing squat ( 3 deep breaths between reps ) 1x20 1x15
Superset light pullovers 2x12
Standing Military press 3x8
Bent rows 3x8
Incline press 2x8
BB Curls 2x8
Dips 2xmax
I did change 2 things though. I added deadlifts, and replaced curls for pull ups. We dont have "pumping guns" do we nic
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Keeping that same routine was great to measure progress and make sure your heaading in the right direction.
Once your 1rms get up to around 140-100-180, you can look at doing some other workouts. I did a bit of 5x5, while running a PTC deadlift cycle which got me to 200kg, and am now running the PPP by PTC. I hope i can run this to a 130-180-240.
Head down, bum up, and plenty of blood, sweat and tears will get you where you want to be
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Best of luck champ.