I brought this up a while back, don't remember if HTC ever commented on it.  
Actually, the 109E isn't porked if you look at that chart.  That chart says time to a 45 degree bank.  Looks to me at 200 mph, the 109E takes about 1 second to roll 45 degrees.  If I remember correctly, it took about 8 to 9 seconds to roll 360 in AH.  45x8=360.  
On the other hand, the Spitfire I, according to that chart, should have a whopping 15 second 360 roll time, but it does a 360 roll in 6 seconds.  The 109F4 also rolls a LOT faster than the 109E4, I believe it was turning in a 360 roll of somewhere around 5-6 seconds also.  The later Spits, if I remember correctly, took 4-5 seconds to do a 360 roll.  All of this is in AH, no idea how long they took in real life.