I was just thinking of this las night while laboring up a 14% grade on my 3 speed Phillips Roadster. Slack slack head angle, big diameter (28 x 1 1/2") wheels and plenty of fork rake. I did not do the calc's but talk about wheel flop!

That and it is amazing how without careful study a steepish head angle (74° as per your example) and little fork rake has more trail than less. What "looks" fast and twitchy may not be. Late Paramounts and Waterford's often have this look.

In looking at my own bikes that I as time permits are throwing onto a CAD program, Front center (beeline between BB and front axle) often means just as much to me as how a bike feels. The one surprise to me was a bike long gone, a British built "criterium" machine. 74 HA, 73 SA, 22.375" front center (can you say OVERLAP) 15.25" chainstays, 11" high BB with 250 Clement tires. Great Criterium weapon, I could pedal through corners with 165's that only one guy could dare pedal too and he had a Schroder with an even higher BB. Other guys tried to pedal through to keep up and I would hear the pedal strikes and epithets that followed. This was very useful in the final turn before the sprint.

Another comment related to this is when inputting the take-off frame dimensions, I have had to go back and double check from time to time as what one expects might be a "clean" dimension of the top tube is actually messy, like 558mm, not 56 cm. The CAD program won't let you fudge.