Small technical question regarding the cutting of the fork. Until now, I cut my fork at the level of the stem then with the expander I was 2mm above the stem and then I placed a 5mm spacer to compress the headset (classic process). I'm going to build a bike with integrated wiring and the cap is flush with the handlebars and I was wondering how high the expander should be from the top? Still 3mm for good compression? With this system (more aesthetic), isn't the top of the fork buried in the stem subject to too much pressure?
I sometimes see people cutting their fork flush with the handlebars, then placing the cover but I tell myself that there must not be enough compression. Clarification would be appreciated

Does anyone have any information, feedback (driving, ease of construction, etc.) on the SP RO25 SL road frame?