Oh, three builders.. ick. I'd probably stay at 8 until the defenses are maxed.
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Good idea but you'd have to upgrade camps and lab as well. Much better idea, as you'd get much stronger offensive capabilities with only a small bit extra war weight.
Been there, Done that. And I kind of enjoyed Feel. Didn't care about players raiding me...Heavy donations...Heavy Attacks. Royal feel :P
So, I would rather sit on elixir...feel rich and do elixir heavy raids (pekkas + heals), get more DE in process for King upgrade...rather than moving to TH9 and getting into all that mess.
Walls do weigh more now than before in wars, but I highly doubt that's significant enough to offset the weightage of your defenses, which are not maxed out for a TH8 level. So early movement to TH9...it can be done, but not recommended.
3 builders definitely make things slow. Did you consider pushing to Crystal or Master for more gems, so you can get more builders. That can help your situation a bit. But in case you are too active in game and barching collector raids all the way....there's too much loot available for a TH8 in game..your storages will always be full no matter what :P