I c where you got the info from now! Ill most likely have a new bar monday!
You may want to hold off a bit on that one...
The Protool bar is designed to be run in reverse direction, so it´s oil holes are on the opposite side of the blade. As it seems, a standard 91 blade won´t fit, unless you want to run your chain without lubrication.
The fact that there´s an oil hole at the right side facing you means that the blade is reversible BTW, and you should definitely do that - prserves the bar AND the chain.
1,6 kW input power transforms in less then 2 Hp output, so you probably don't even want a longer blade, although 30cm might work out.
My 2Hp tophandle chainsaw swings that exact same chain around on a 30cm blade, but i sure wouldn't want to bury anything close to it's full length in wood while cutting.
As a contrast: My Stihl MS660 felling saw definitely needs its 7+ Hp to swing around a 63cm blade in denser woods... although a 75 cm blade would do in softwoods.
What I WOULD do in your case is get an extra chain for ripping cuts, the 91R type will do fine. It will save you the hassle of regrinding a standard chain to a low angle. Mind you these chains are NOT low kickback chains, at least the 91R isn't. But I suppose that won't matter to much in this application on a guide rail...
Regards,
Job