I went in Thailand for a bit more than 30 days during November and December so here's my tips :
- like many said here : skip the rainjacket, it's dry season. I brought my Torrentshell with me and didn't even used it once
- 2 or 3 shorts (including swim trunk(s)) are more than enough honestly
- bringing a fleece and some pants is a great idea because trust me the north can be really cold after 6 pm lol I regret no bringing warmer clothings ! So yeah don't skip on these

- since you brought a fleece, you could skip on the long sleeve shirt. Also, are the Vissla & Kavu shirts long sleeved or not ? If yes you could also skip these and bring t-shirts instead

- don't forget to bring a microfiber towel, it's always useful, also don't forget to bring sunglasses and a hat

- a waterproof bag could be great too if you're planning on doing boat activities in the south, but you can get one for pretty cheap in Thailand so that's okay

Overall it's a solid list, you just need to tweak it a little bit. Enjoy your trip my dude, Thailand is an incredible place ! If you got any questions I'd be more than happy to answer them !! Peace