RE: proper arrow-what grain?
I just looked at the gold tip arrows charts and they don't take any consideration for what your actual draw length is, the type of bow you shoot or anything else.
If you told this chart you are shooting 26 inch arrows it is going to assume you have a shorter draw length since it doesn't ask if you have an overdraw. I understand that either way it still shows the same arrow, but my understanding is gold tip is notorious for being off on the weak side with arrows. If you are looking for more weight my advice is to bump up to the next arrow size and use 28 inch arrows. This will give you more weight and a stiffer spine which will be more consistant from arrow to arrow (another problem with goldtips and other carbon arrows). Normally there is nothing wrong with shooting an arrow on the stiff side, other than shooting more weight than you need. But a weak spine arrow can cause all kinds of problems.
I would say if you can find someone on here with the software have them run your setup and see what arrows it suggests.
Paul