The only reason I was talking about going deeper is to squeeze some more ft/s from the cartridge.
I think you are working backwards, will deeper will give you more fps, yes, but the deeper you go the more you increase pressure, so to just make up something to give an example
5gr powder X at 1.15 say 1100 fps 29000 PSI, 5gr powder X at 1.10 1130 fps 32,000 PSI
So yes you picked up vel but pressure went up to. If you are a MAX pressure at 1.15 going to 1.10 and staying inside pressure limits would require reducing the powder charge.
If for example factory data show MAX pressure at 1.15 with 5 grains and a vel of 1120 reducing the OAL to 1.10 and then working up to 1120 fps might give you a vel of 1120 fps at say 4.8 gr of powder
but
the pressure will not be the same as the first load. (most likely it will be higher)
I don't load over MAX and if you decide to do it that is your choice, it is a free country...
I shoot USPSA, some people shoot 9mm Major (loads over MAX)
In almost all cases they like to load long, more space in the case for powder and loading longer lowers pressure (which they turn around and increase by using more powder)
Think of it like .38 special/.357.
If I take a load for .38 Special and put it in a .357 case, more case vol = less pressure=less velocity.
Sorry if this is long winded but if your after more vel and trying to stay in pressure limits you either need to change powders or load longer.
In pistol cals you need to have enough vel to expand bullets, but if you were hunting for example, I doubt what you shot would know the difference between say a bullet at 1100 fps and 1 at 1150, and paper targets sure won't.
Bullet drop and wind deflection won't be that much different for another 50fps.
So in IMWO it's not worth "pushing" to get a little more vel that probably won't make a real world difference in anything other than numbers on paper.
Welcome to THR, and sorry if I sound "preachy" I just like to err on the side of caution, maybe I'm just chicken in my old age.