i would say put it all into vit. i can understand keeping the str, you might want to use different weapons eventually. maybe bring it down to either 20(dragon slayer bow,great lord gs) or 16(tons of weapons. flamberge and silver knight ss are good ones for 16/str45/dex). keep it at 24 if you think you will use some ultra gs or my most recommended if you plan on keeping it at 25 the server. it might actually be worth putting a little more str so you can 1hand the murakumo(it scales A with dex) its the best weapon for a 28str/45dex character imo.
Wear full dark silver armor Garl - and Bramdt - and your shield... Oh wait, Dark Souls... hmm - you should try a cosplay of garl xD but for this build I would say the last 7 points could go into attunement and chuck a Great combustion in.