The charts and online arrow selection programs are just a guideline to get you close. They simply don't ask for enough information to be exact. Sometimes you can shoot a weaker arrow and be fine, especially for target type stuff. Usually you are better off if you go to the stiff side though.

The only thing I can tell you is if you want to try some new arrows just try them and see how they do. However if you do it make it a fair comparison. You will need to retune your bow for the new arrows in order to see if they are really better. Not just slap them in and start shooting them. You are going to have to do some sort of bare shaft or broad head testing to varify that spine is actually better.

My opinion is like the rest of the guys, if you are happy and it isn't broke don't try and fix it.

If you want to know if the spine could be better on the current arrows you are shooting play with the draw weight on your bow. If you turn the poundage down and they fly better then they are weak, if you turn it up and they fly better then they were stiff. This is one of the main advantages to having a bow with adjustable limbs, so you can tune the bow to the arrows. You use the chart to get arrows that are close, and then tune from there. You can do the same thing with arrow length. Longer arrows will be weaker and shorter arrows will be more stiff.

Paul