Equidistant-tinsels are very much the standard practice and standard lesson - I "hear'' you there and acknowledge. What I aimed for is an off-set in that distance while maintaining the interval and balance in-between bands. I am especially keen on the "vein" created by closely ribbed tinsels: common but maybe not the usual.Good explanation of what you did and why. In my opinion, the fly would look better if the flat and oval tinsels were equal distance apart all the way up the hook. I'd wrap the flat first after the body is done. I'd follow this with the marabou (or whatever other spey hackle you might use) going from tip at the front and wrap back down the body. Lastly, I'd wrap the oval forward over the spey hackle locking it in place.