Lovely quilting and it is right for the design ... I went for something very similar albeit by a professional longarmer ...
but for every bodies sake, not least yours .. do whatever you need to preserve your sanity!!!!
If it is a long term project (ie you coming back to it every few months) ... then certainly keep the waves close together ... but if you want it done and dusted, why not space them out towards the edges ... actually I think I would prefer that option now the idea has percolated through my brain!