Fi feels weighty to me. one way i look at the difference between Fi and Fe is that Fi keeps the emotional resonances of its experiences and Fe doesn't. when i remember emotional states, it's not a concrete element, but the relationship between various things, the mood of something. but even then, the mood is difficult to recover, and what is left over is what is articulated as i attempt to understand that mood, a statement produced. what is stored is perceptual information, ideas, concepts, webs of relationship that can be imagined from various external representations of self, from my perspective. we keep more embodied voices around to judge these ideas thru Fe employing a highly advanced contextualization. whereas you keep all of your specific feelings. you use Ne to give articulation and to FIND or CONNECT your disparate and amorphous blob of Fi values into concrete metaphors. you use concrete to build analogies. we keep the analogies, but get rid of the concrete until they're just pure ethereal mind-stuff.
i don't see weighty Fi. i see wounded Fe that is trying to over-project an image to provide internal space, distance from the actual responses of others and actual recognition of self by others. hence the e3.
when i need space, i just shut the fuck up and walk away. maybe say something extremely pointed first (or probably later). that's the 5w4 vs 3w4. 5s hyperinflate themselves in their own private world, whereas 3s try to do it in the eyes of others. the 4w is the easily wounded part, reading negative experiences as personal defects and terrified of feeling ashamed before self and others.