For tightening up the radius, if you've got a press just knock up a rough bender in the same style as one of the cheap hydraulic pipe benders. 
Just a bit of round stock on the ram (larger the better) and a couple of pieces of round (or ideally flat on a rod that can rotate as the radius changes) to go underneath with a gap in between..
Like this but upside down and don't need the round press dies since your stiffener has flats.TTI - Pipe Bender 12T - PB12 | Total Tools
Just press a little, move along, press a little, rinse and repeat until you have the radius you need.
Much more controllable than the BFH.
Steve
				
			 
			
		 
			
				
			
			
				1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
1988 120 with rust and potential
1999 300tdi 130 single cab - "stock as bro"
2003 D2a Td5 - the boss's daily drive
			
			
		 
	
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