I find that Redline, along with a couple other high moly oils, can quiet down an engine. Not sure if its the moly but that was the only commonality. Not sure what the weather is like where your cold starts are, but a 0w will flow much quicker too.
If you want to extend the oil interval, keep the full flow filter where it is. Add a bypass filter fed off a T at the oil pressure sender, and return it to the pan or oil cap.
A Frantz filter kit(using Frantz media or toilet paper rolls), along with the Amsoil BP-89 oil cap swivel return is something worth looking into. Frantz filters can sometimes be found at swap meets and on ebay pretty cheap.
oil cap return swivel
Frantz
Frantz
Also, check into the bypass filter forum here. There are various brands to choose from. Frantz, oilguard, motorguard, stilko, trasko, racor, luberfiner, harvard, NTZ, Amsoil.....