There is not much that you are going to do to make a part the size of those ones, stronger. The real challenge is in making them fit correctly. Looking at mine, I saw evidence that there was a hella lot of hand filing and stoning done, on several of the small parts.
They are about as big as will fit in the space provided.
The double spring that holds the cylinder stop lever IIRC) in place is as fine a bit of fiddly adjusting as you will see anywhere, and the length of the hammer give a fella a fine lever to bend, break, or otherwise mutilate a bunch of the small parts in the train of events that take place when the action is cycled.
The sear is a recipient of more harm than it should, if the hammer is pulled all the way back and released to fall against the sear surfaces.
Wear in the pivot pints of the cylinder latch and the trigger (?, the two pivots that come out the LH side of the frame, in any case) also adds to the slop, and thus the out-of-time problems that develop, many of which seem to be instinctively handled, by pulling harder on the trigger or hammer, to the detriment of the internal parts...
Cheers
Trev