C_G, only difference between 853 and normal cromoly steel is weight. Two identical frames, one made of 853 and the other made of cromo, the 853’s extra strength would allow approximately 1/3 to 1/2 lb to be saved.
In other words, not very much! You can save that sort of weight elsewhere very easily… Wheels, tyres for example, where they make more difference.
Fwiw, if a 14″ inbred is too short, and a 16″ too long, you could do a lot worse than try a 16″ genesis io. They may be “normal” cromo not 853, but they’re very good frames and probably lighter than the pipedream Sirius (which is massively overweight for an 853 frame at 5.5lb!). 16″ genesis is 22.4″ TT I think, about spot on for you…