Terry, don't be deceived by "small" heads. I talked to Nic at Steelforce and he explained how compact heads actually increases penetration. That's why he says his Phathead is his best head and "traditional" 3:1 two blades actually can bring less penetration than a compact 4 blade. His explaination was that it was the front of the blade that cuts more than the back, if that makes any sense.
If you ever get a chance, try some Phatheads. They come in 75, 100, 125, 145 and 190gr. Something for everyone.
Nic mentioned that a hunter had a complete pass thru on a giraffe with a Phathead. That's a rare feat. He said the guide couldn't believe it.
I haven't tested the F-15's yet, but the Carbon Express XT 4 blades seem to be a great head. Scary sharp out of the box, for the re-sharpening challenged. It's basically a 2 blade with thick bleeders at the tip, as opposed to farther back.
The back of the blade is also sharp.
Here's the XT...
http://www.carbonexpressarrows.com/cms/content/xt-4-blade I also have 150gr and 210gr Silver Flames. To be honest, the XT's are like a poor man's Silver Flame if his setup requires a 100gr head. Granted, like lots of stuff today, they are made in China.
But if you have weighted inserts and use a 100gr head, the XT rates right there with the Steelforce Phathead.
I'm going to shoot a deer with the XT's this Fall and I'll give an update then.
I'm going to buy a pack of F-15 to test on the range, just to test the flight and noise.
I had talked to Jim Belcher on phone and he gave the F-15's rave reviews, which made me want to give them a try.