I hate guys like you because when you bring me your engine to rebuild all the cylinders are oval. Many cases I end up sleeving the thing as you lugged the engine and scraped the oil film off the side of your cylinders.
If I had to go up a 7% grade I would select 3rd gear and about 3500 rpms,but thats me.
This way you get adequate cooling and lubrication flowing through the engine. Lugging an engine like that also created harmonics throughout the derivation and extra undo stress to the system.