It's really going to depend on how well you have the bow tuned. I'm not an expert on tuning, just a tinker. Broadhead flight tends to magnify any issues with an out-of-tune problem. The ABC Super Sonics only come in 85 grain, you're shooting the regular Sonic head at 75 grain. The minimal difference in surface area between the two shouldn't make a huge difference if your bow is tuned.
Your arrow spine reads OK for the draw and weight, but the 27 inch arrow sounds like you are bringing the broadhead back onto the riser shelf of the bow? Fall-away rest mounted behind the riser, like a QAD?
What range are you setting as your max range?
