I'm also in Oregon, but the wind I deal with comes from the Gorge not off the ocean. My first year growing outdoors I followed all the internet advice and went as big as I could, which was 100 gallon pots. In subsequent years I just put them in the ground, and what I found was there was little to no difference between 100g pot and the ground -- because at that point the limiting factor is the length of our grow season. The plants didn't have time to get big enough to outgrow a 100g pot.
I don't know what your med needs are, but I would let those requirements be the guiding factor and not simply try to grow as much as you can. Huge plants can be a lot to manage and then harvest, cure, and store. I ended out making a lot of hash, budder, and tincture because it condensed everything down.
I've also grown outdoors in smaller pots and moved them, in my case I finished a couple in the garage under lights. Keep in mind that the smaller the pot, the more critical your feeding routine will be. Towards the end they'll eat and drink a lot, and you have to balance giving them enough nutes with not burning them in the small amount of soil relative to the the large plant size. For me, I found that 20 gallon fabric pots were as big as I wanted to go when it came to one I planned on moving. (As Always-) Depending on the strain, you can get a heavy producer in a 20 gallon pot and get a LOT of good meds from it. I found that 10-15 gallons was too small, and the plants would grow huge while vegging and then tend to fall over, and get root bound and deplete the soil and need frequent feedings. Even the 20 gallon fabric needed to be watered daily. I ended out putting a couple of pin-holes in the bottom of 2 liter plastic bottles and leaving them upside down in the pot to drip feed them.
It's a good thing you have a greenhouse, I suspect you'll find the biggest challenge of the whole season to be the last few weeks before harvest, when the buds are getting fat and dense and the moisture in the air is rising and you're trying to fend off powdery mildew and mold/bud rot. Most of the photos I've grown outdoors here in Oregon were harvested earlier than I would have if they were indoors, I just ran out of time and had to take them down. If I were on the coast I would plan on not growing plants that were so big that I could not get them through my greenhouse door -- because that is where I'd want to finish them. I had to tie them up like xmas trees to get them into my detached garage (which no longer has a 'car door', just 'people' doors on it).
Sorry for the long post, but last thought -- now I only grow Autos outdoors, they are done by early September before the rains come...
(Edit: This is a Jillybean in a 20 gallon pot...
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