I trying to find a carbon arrow in the 500gr range, however all the ones that seem to be that heavy require long arrows and heavy draw weights due to the spine factor. What do you guys think, would you place much reliance on the spine issue or would you go with the correct spine and then add weight tubes? By the way, with my setup of 100gr tip, 3 four inch vanes and 28.5 inch arrow, the charts say get a arrow in the 400gr range. Thanks for any input.