Thanks everybody! Already on my next set, as I made a mistake with the spining and had to sand them all down which made a couple too weak near the point.
Ordered a new set of 35-40 spine arrows but they were still way too heavy which is pretty confusing. Will just have to be more careful sanding them down this time!
Really appreciate all the replies though, nothing like having your early work congratulated by those with so much experience!