Your total weight is fine. More tip weight will give better arrow flight but it will also increase the total weight. 3/8" dowels are a tad big for arrows. IMO. Smaller diameter with the same spine would be a little better. It's time to try self nocks too. They are easy if you take your time and way more reliable and durable than plastic nocks.
Now is a good time to find shoot shafting while it is in leaf and in fruit(easy identification). You won't harvest until after the leaves drop(you can but better arrows later). Shrubs or small trees like red osier dogwood, pagoda (alternate leaf) dogwood, silky dogwood, gray or rough leaf dogwood, native viburnums, hazel nut, switch, river or hill cane, exotic bamboos, tomato stakes bamboo(Tonkin), sourwood shoots and probably many more will make very good arrows and will teach you how to make an arrow. Where do you live? There are probably local shoots and/or cane right around the corner.