After getting everything in line and compressed properly, I find that the steering column "flexes." It doesn't wobble back and forth, it doesn't shift backward/forward when you push and pull on it, but the bars "bend" with pressure, always returning back . It's not a loose feeling at all, the whole column is flexing like a skyscraper in the wind. Would a taller clamp clamping a greater portion of the ends of the fork and bars help correct this to any degree?
(this post has been edited from my original inquiry about oversized bars correcting the flex)
your bars flex, thats normal for something with leverage type stress plus the size you have. 1/2 inch compared to 27.5 inches or fraction 1/55 isnt much but yes its something and will make a tiny difference but with a cost of problems being moved or expressed differently not eliminated entirely.
you say you hate alu forks? they are made for a good reason although you may know they have risks also for yourself. id expect you have steel ones, that brings up the problem with a bigger scs. its gonna make your bars feel more stiff then they are at the fork/scs/bar connection and thats 1/2 the bad news ironically.
putting on a 4 inch scs will make the fork more prone to being the weakest point and wreck havok on front balance which i dunno why youd want that but also as you want to know, the 4" scs will help with the feeling of the bars that you are asking for and if ridden right would be a bulletproof combo for sometime, not forever. i can make my scoot last a day or a year, up to me.
i already know thats the opposite of what would help to make riding easier, more weight and more to the point off balance. your scooter would have to be a tank in my eyes. i rode for mgp, i will never ride a scooter over 3 kg again but if thats what YOU want then thats the estimated plus practical experience expected outcome.