My Swing (KoenA)

[KoenA]

I've been Playing Golf for: about 5 years
My current handicap index or average score is: handicap 15, trending downwards lately
My typical ball flight is: straight and very high
The shot I hate or the "miss" I'm trying to reduce/eliminate is: This has been changing somewhat, typically it's a hook, but lately misses have rather been slices or even the occasional open face hit 

Additional background:

I've only taken very few lessons (including some on evolvr a few years ago around key 1), but try to figure out how to work on my swing based on what I read online (mainly here). I've been progressing quite steadily on my own, but last year over the entire season I only managed to drop my handicap by ~2 points. This year, I aim to do better and want to work on improving my swing.

From looking at my own swing on video, there are two things that strike me:

1) Overswinging: my left arm breaks down at the top of the backswing, even when I try to 'feel' a shorter backswing
2) Early release: I release the golfclub way to early on the downswing. I still get a decent contact, and am not lacking for distance (7 iron goes 145-150 meter) but my ballflight is way too high and unplayable in windy circumstances

Despite trying to work on these, I just can't seem to get these right. Maybe I need to practice more/better, or maybe I'm doing things in my swing to which the natural reaction is the errors I see. Especially for the early release, I can keep the lag in practice swings, but as soon as there is a ball I go back to the early release.

Would love to get some insight from everyone on here on what to work on (and ideally how). In the below videos, I've included a practice swing and a real one right after that.

Thanks in advance everyone for your help!

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Videos: 

 

 

[iacas]

I would address two things right now:

• Posture (a bit too much bend in the knees, a bit too much butt hanging out behind your heels).
• The "long arms" feel on the follow-through.

That should help get you started on that.

Happy birthday!