Wondering whether the softer alloy is less likely to crack than harder. The use of a different material for the ramp is good? Titanium does scratch and can not be refinished like stainless that I know.
Titanium and 7075-T6 or 7075-T7 are hard, and strong, but like all such alloys they've very little toughness, which is what you I think are mistaking softness for. Toughness is what makes steel ultimately superior, its ability to give a little, makes it relatively flexible, and this in turn makes it very durable. Aluminum alloy has virtually no toughness whatsoever, its tolerances respond accordingly, its impact resistance is nowhere near that of steel. 7075-T6 has a rockwell C scale of about 52-54, which is quite hard, on par with some industry stainless steels, further, it can be hard coat anodized to a surface hardness of RC 70 or greater, this is very hard and durable, offering very good wear resistance, but its not going to respond as well to drops, and hard knocks, lubrication is very important to aluminum alloys.
Most of the issues with aluminum alloy framed 1911's are due to the feed ramp being degraded by sharp edged JHP's, which can gouge it, some exhibit this trait and some don't, yet ball ammunition does not contribute to the problem at all, and that is what we shoot the most, you should be able to fire thousands of such rounds trouble free, I would definitely steer clear of big gaping JHP's, with thin walled sharp edges that can cut, Federal HST's are probably not the best choice for extended shooting, and due to price they never will be for most. Its also a very wise practice to ditch all magazines with older type metal followers, such as those shipped off with every Colt pistol, I use nothing but Wilson and Metalform. Other then that, just be careful not to go knocking your lightweight frame around, don't drop it, and keep it nicely lubed, you should have no problems with loads of shooting.
