Hmm...
After some very careful reading of your posts...all of which occur within the timespan of any single one of mine, making it difficult...and once again trying to model the relative movements of your little rock web and the action of firing a bow...I'm still not quite sure what to think about the first two points, though I will concede their validity. What an uppercut is is irrelevant regarding whether or not it hits my face, and if in fact it reaches me in the instant after I finish materializing, my face would in fact be mostly protected due to the act of drawing the bow, which means my right arm is in fact in the way of your rocks and protecting my face. And since it would be the part of my right arm that does in fact have armor that would be blocking that, it would still have the same effect as what I posted...cuts and abrasions along the left...I repeat, LEFT, because despite your attack not coming from the left in regard to the tunnel, MY left side is the side facing you and exposed to danger...side of my body. However if your attack hits in the last moments of my pulling the arrows back, the moments in which my face is in fact exposed, then not only are you microseconds away from me firing the bow and it is a pretty good chance that I'll get the shot off before you hit, but it doesn't actually matter because your rocks do not hit my aiming arm first to knock off his aim until after he is likely to have already released the shot from the fact that he is being hit by a number of rocks and is suddenly surprised and in pain, rather than planning. However, no scenario there includes the possibility of the explosive head of the explosive arrow, which is a yard in front of my face, getting hit or impeded in any way. I would guess you are going to go for the probability that doesn't bear the near certainty of your death, though it has less effect on me, but I will leave that up to you...or some neutral party, since as I said, I am not sure what to think.

Now, as for the last point, there I don't see where you have a case. Yes, you described the rocks as chunks, and yes, you said clobbered. Both of these are vague descriptions, and both are met with the most I made. Clobbered certainly includes cuts, scrapes, bruises, abrasions, and pain from being hit very hard. And no, I am not denying Shashous's ability to throw them at me very fast. However the only factor really here that does matter is how large those chunks of rock are. If I permanently stuck a rope to a wall, then pulled with infinite strength, the paint would come off the wall...not the sheetrock underneath. Basalt is a very hard rock to be sure...but this also means it is very brittle, and the way it is formed means that it comes up in layers. (I did the research) Fractured shards and jagged chunks of rock would certainly come off a basalt wall...but they would be no bigger than a softball, the minimum size required to do any more damage than I stated. The most you could hope for is some lacerations thrown in there with the rest of the descriptive terms I used, or maybe a fractured rib or two, which again, certainly coincides with your word "clobber". But it is physically impossible for more without substantial size to the projectile, or far more significant mass...like lead or gold, not stone. The maximum effect you could achieve is depriving me of my use of my left arm for the most part due to sliced and shredded muscle, or slicing my face, however by the time it hits my arm I doubt it will carry enough force to do that after having already expended its initial impact on my torso, and something similar goes for my face, though I have no doubt it would still be painful. I don't question your monster's physical ability...I question that of the tool it uses, which is an adapted one from my character, with pieces of the neutral environment thrown in. 

Also, really your creature's speed matters more than his strength in this case...I can spin a knotted rope around my head as fast as I can, and someone ten times stronger can do the same, but it won't matter because as long as we can swing it then it is the speed of the swinging that has an effect.

And finally...you also wouldn't have a case in saying he sucks at archery, because there is no such thing as a bow that requires a certain amount of time to draw. Again, what matters is the person wielding it.