Re: PSE TAC 15 crossbow - which broadhead are you using?
I hate responding to this question because as I've said before, it's almost a religious issue with many archers and it raises more controversy than it's worth.
The main reason for this is two fold, the first being that everybody who uses a particular broadhead thinks what they're using is the best.
The second reason is solely based on a lack of knowledge or information on how to properly tune any given broadhead to the arrow shafts that one is using.
I'm not going into a broadhead tuning exercise in this response, so that will need to wait for a better time. I will say that the advice given by the PSE engineers is valid as long as you are using the standard four fletch configuration on your arrows. With a little bit of tuning work by gradually rotating the broadheads to different clock positions and then insuring each arrows broadhead is positioned exactly the same, you can get good results out to 80 and 90 yards. I have a set of these arrows and broadheads made up and I get good accuracy and results from them.
I also have another set of arrow shafts made up using the G-5 Montec CS 100's that Wet Willie had mentioned and these are my primary go to arrows when I'm shooting three fletch arrow configurations. These are excellent shooting heads that are factory high speed spin balanced and they are the sharpest heads in the industry period. I align these heads to match my vane positions and then only need to balance the weight of each arrow, so they are identical. These arrows are extremely accurate out to 100 yards, but the further out you go, the closely matched and balanced every arrow needs to be.
When I bought a dozen of these heads, the weight of each head was as follows:
These heads are closely matched, but without weight adjustments to each broadhead how would one expect to maintain equal elevation at 80, 90 or 100 yards. The Phatheads have a much wider deviation than the Montecs. Most other broadheads have even more deviation, so if you are expecting great results without putting in the time and work to balance and tune your equipment correctly, you may want to rethink your expectations a little.
P.S. You can purchase 3 different weights of broadhead washers from Bowhunters or any number of other places. They are steel washers, aluminum washers and synthetic washers. These mount between your broadhead and arrow shaft. By using different combinations of these washers you can alter the weight of each finished arrow to keep all within 1/10th to 3/10ths of 1 grain. Start with your heaviest shaft and your lightest broadhead. Weigh this combination. Whatever it weighs, you can then bring every other arrow in your dozen to match this weight by adding either a heavier broadhead or another broadhead and some combination of broadhead washers. Take your time and work slowly and carefully until you have them all completed.
Once you are weight matched, all you have left is the tuning of the broadheads via proper positioning.
Good luck and good shooting.