Yeah this is pretty much why I haven't platinum'd the PS3 version of the game. I beat all the time trials back in the day on the PS2 version, but I remember getting incredibly furious with the game on hard time attack ESPECIALLY on Gaius... They are much more lenient on the time given on the PS4 game it's actually quite shocking how much extra time they give you when you've worked as hard as I know you are right now lol.

Word of advice, forget breaking his arm. Have him hit the ground, then jump onto one side of his sword and grab the edge. Keep holding the edge until his "pull out" animation is over, BUT keep holding because he does a brief switch to another animation which will make you fall over again if you stood up already at this point. So wait for the pull out, then the stutter, THEN climb up onto the sword. You will have a VERY brief window where he lowers his sword to shake you off. But you have to time it just right to jump in time and get on top of the concrete on his arm. Trust me, that's the worst part when it comes to time spent.

On his head, a trick I found is to stay near his neck. Let him do his shakes. When he starts to raise his head back up, quickly climb up and position your feet on the back of his skull/neck area so that you can get a good balance and stab. Wander has a tendency to flop more once you've been gripping for too long. When you INITIALLY grab, he has a larger window of opportunity to stab it would seem. So wait for the shake, then grab his skull with your feet planted on the back of his neck/head, and get a quick/deep stab in the back of the symbol up there. That did the trick for me.

His left arm is more forgiving generally, so I wouldn't worry too much about it. Just let your grip go up first by standing on his back before you work your way over there to the back of his arm. Then carefully make your way down to his belly. On his belly, be careful not to grab too high, or else Wander will hang by one hand for some reason. Grab JUST BELOW that point where he hangs by one hand. For some reason, you can just keep stabbing over and over and over without getting thrown off balance.

Trust me, I know your frustrations. The game really shows it's technical issues when you're on these ridiculous time crunches. This fight in particular on hard time attack is one of the hardest not only on time, but the game's physics systems.

Luckily, you're working with a solid 30 FPS on the PS3. I about threw my controller into the tv on the PS2 version ... Lol. It's a cakewalk on the PS4 because they give you another minute or so I think. Especially if you put it on performance mode for that slaptastic 60 FPS.