"Yes and so the version of events where austria can 'guarentee' two builds leaves italy with the option of taking tunis and trieste. (as unfortunately tunis and greece is impossible, and tunis+serbia is rather more dangerous)"
Well, if you go there in S01, sure. If you wait until A01, Austria probably covers Trieste then, since it can recover Galicia in S02 with the 2 army builds.
"Russia arranging a bounce in pru/sil doesn't necessarily prevent him from taking sweden - germany still has the same reasons to gift or not gift russia with a build (and i often give nothing to russia... ) meanwhile germany is not guarenteed two builds."
Eh, firstly, if I'm Germany, I'm setting the price for Sweden to be DMZs in Prussia/Silesia/Baltic Sea at a minimum. And I usually give Russia Sweden unless he gives me a reason not to do so, simply because there's little point in weakening Russia before you know you don't need his help. England doesn't have to reveal anti-German sentiments until A01 moves at the absolute earliest, by which point you'll already be alienating Russia with the Sweden bounce... and an Anglo-Russian alliance is probably the quickest way to bring down Germany of any 2-power alliance available at the start, because Germany's weakness is in the north. So it's really not wise to throw your fate entirely in the hands of another power - but that's exactly what bouncing Sweden does.
All that to say that there's no reason for Russia to assume Germany is disingenuous about Sweden, and if he assumes Germany is genuine then Germany can easily just say "Well, DMZ Prussia/Silesia, and you can have Sweden," and that's that.
...
But even if we assume a bounce, that still requires England to bounce Holland in A01, which is really rare in and of itself. So even then it's unlikely that Germany doesn't go +2.
re: France - Sure, but if Italy's going to Tyrolia anyway, then there's really no reason for Italy not to be honest and say "Let's DMZ Piedmont." After all, you're a big fan of Italy taking Munich in A01... if you knew you were going to Tyrolia and were at least open to that idea, why not tell France "Let's DMZ Piedmont and if you want to stay in Marseilles, support yourself to Burgundy instead"? Then you've got a chance to get French support into Munich instead of making an enemy for no good reason.
I'm really not sure what your point has been with any of these objections. If it's been to needle away at "guaranteed" to make it "almost guaranteed," okay, then it's "almost guaranteed," but it's going to happen the vast majority of the time so there's really no point in contesting it. And if it's been to make a more substantial objection... I'm not seeing where that's being made.