Ignore color - you are saying you want to raise BEEF to sell freezer trade - so color does not matter. Bottom line, you need to produce MUSCLING. Your Hereford bull does not show muscling (from the pictures). You can have a great tempered bull AND have a good muscled bull also. You are single trait picking your bull. Takes a long time to produce that carcass hanging on the rail for your customer. You want as much weight as possible. Doesn't make any difference what COLOR it is - hide is gone. But, muscling and rate of gain is what will make you money.
I am 74 years young, female, walk around my 50 head of cows, never need to watch my back. Cull for good temperaments.
And, not all bulls born should be kept a bull. If you say this young bull calf is out of a runt of a sire, I wouldn't even think about using him as a bull. That runt genetics is in this calf you have, no matter how well "he" might grow. Make him a steer and enjoy his meat - not his genetics.
We all enjoy looking at our cattle. The hardest thing for most people is to actually SEE their animals and be able to be critical. We refer that as being "barn blind".
I think you are on the right track wanting good big stout momma cows that milk good and have good temperaments.