For me, the way I'm tentatively going to work with ramp angles in boots is to experiment with different boots on different skis, and similarly with cork heal wedges, since they've worked for me for some time. I ski a lot of days a year, and find such equipment tinkering fun.
In this case, a quiver of boots I have: different boots, different ramps angles I'm trying out on different skis; and using those cork heal wedges until I reach the limits of that, or figure out enough to do it on the bindings or with a boot fitter instead, using what I've learned.
I'd like to trust myself to tell what works and what doesn't - for me, from experience. I trust I can tell what works better and what works worse - ski one way, then ski it the other way.
If I were seriously racing, I'd add to the process, maybe. But, hey, I'm retired.
So far in part I've found by experimenting that it's best to generalize only tentatively, that you have try out each likely combination for yourself.
Nonetheless, for a shorter turning ski, like a slalom ski (~r 12-14) or even a masters gs ski (~r. 19), increasing my ramp angle slightly with a cork heal wedge (putting myself slightly more forward on the inner platform of my boot) in Lange RS 130 boots can be an improvement. The ski can feel noticeably quicker, more precise. At least a fun change.
Conversely, for a wider turning ski like a woman's gs ski (~r. 23-30), increasing my ramp angle slightly the same amount, in the same way, in the same boots, can be a detriment. It can put me slightly at cross purposes to the natural carve and flex of those skis, hurting the feel of the carve and the precision and control I'd normally get.
I've done similar experiments using the slightly softer RS 130 up against the stiffer Lange World Cup Super Comp 140 boots. The results, for me, are incomplete, but so far seem to point to the stiffer boots, once properly bedded, being better for quicker turning/shorter radius skis and, for now, detrimental for my woman's FIS skis - a surprise to me.
As near as I can tell, the differences are easily noticeable from ski to ski, and hard for me to predict, as yet. Input from knowledgeable folks can always help.
That's why a chance conversation I had this week with an elite racer about boots was a real bonus.
This past Friday at A Basin I noticed a young male racer at the bottom of the hill changing his boots over and over, from Lange to Head and back. He had U.S. ski team and U.S. Developmental (or practice?) team clothing on, and skied well. Very well.
(I found out he was actually on a national U.S. Developmental team, though I suspect that at year end that might mean with added candidates who will have to try out in the fall to make the more select B,C and D teams chosen at Copper Mountain - not sure about all this, or whether he was already on one of those alphabet teams.)
Anyway, he'd make a run on his Fischer WC FIS men's spec GS skis, then he'd switch boots by taking his foot with lace up Lange inner boots out of one outer shell boot and into another. (The boots were
1) Lange blue race boot outer shells, not sure which model, but seemingly a molded one inside rather than a plug boot; and
2) Head white race boots, again not sure which model but they seemed to be molded inside also).
He was alternating in this way run after run down Lenawee top to bottom.
So I asked him what process he was up to, how many boots he used, and why.
To my surprise, he answered at length, and we had a great conversation.
The gist of it was that, in general, he and racers around him generally used three to four boots at any one time. Slalom boots needed to be stiffer and with a higher (more forward) ramp angle, gs boots had to be softer, with a lower ramp angle, and downhill boots needed to be canted very precisely for flat running, etc. (for him in particular, as if to make him slightly bowlegged, boots/skis were turned slightly outward with canting).
In his case, he had two different gs boots that I'd seen him using. He had to experiment with them with each ski change to decide which boot worked better, and what adjustment to make in it, if any. (He'd already decided he prefered the Lange liners over the Head liners, in both boots.)
This was hands on experimental testing and modifying of equipment, matching ski to boot in different disciplines.