Low oil pressure?

Yes, rod feed timing. The rest of it will take care of itself. You can put the oil in anywhere you want. As long as the oil timing is correct it will oil. The rest is smoke and mirrors.

I'm not a fan of running two columns of oil at each other. You can have pressure and no flow. I've run into it myself.

Full groove main's will oil the rods full time, right, wrong ?

As long as you have a leak the oil wont stop ?