Considering the Giant TCR Advanceds frame design and intended use as a high-performance road bike, what is the optimal stem length to achieve a balance between aerodynamics, handling, and rider comfort, taking into account the bikes 72.5-degree head tube angle and 405mm chainstay length, and how does this ideal stem length vary depending on the riders position on the bike, specifically the saddle-to-handlebar drop and the knee-over-pedal-spindle (KOPS) alignment, and what are the implications of using a stem that is too long or too short in terms of the bikes overall stability and responsiveness, particularly when cornering or descending at high speeds, and are there any differences in stem length recommendations for riders with different body types, riding styles, or experience levels, and how do these recommendations change when using different types of handlebars, such as compact or ergonomic bars, and what role do factors like handlebar height, saddle height, and cleat position play in determining the ideal stem length for a Giant TCR Advanced?