To make a quick arrow spinner I take a piece of 2x4 and four 2" small diameter nails and angle them towards each other forming a "V" two nails on one end and two on the other approximately 18-20in apart. You can bend the nails in or out to level the v's up. Place arrow in the v's and barely touch the broadhead tip to a box or another piece of wood and spin with the flat part of your hand. Watch the tip of the arrow head for run out or miss alignment.

Deltas are great heads, fly great and deadly as the  plague. I shot them for a while and never had any complaints about flight or sharpness. My dad still shoots and loves them.

same as a lot of others here, been shooting them for over 35 years, I mount mine 12/6 and they fly and kill perfect  . its all in the tuning a wide head will sure show any issues you have..

Now will the extra length of the head which makes the overall length longer if I'm correct will weaken the arrow?

Arrows are typical measured to the back of the head, so the length of an arrow doesn't change based on head design. However the weight of the head will affect the spine. There are lots of good sources for learning more about this. The search function will give you hours of reading on a topic like this.