Four touring bike frames made by various bike manufacturers for heavy loaded touring are under consideration. All frames are the same in almost every way. Same top tube length, same stand over height, same seat tube height, chain stay etc. The only major differences between them are the head and seat tube angles. Bike 1 has a head tube angle of 71 deg. and a seat tube angle of 73.5 deg. Bike 2 has head/seat tube angles of 72/72.5 degrees respectively. Bike 3 has head/seat tube angles of 72.5/74 degrees respectively. Finally Bike 4 has head/seat tube angles of 70/73 degrees respectively. How do these angle differences affect the overall behavior and comfort of these potential bikes? Thank you.