The way I understand it is its a matter of how much abuse (bearing speed) the oil can handle before it starts to degrade. So its really more of a lubrication problem that a parts deal.
I look at it from an endurance engine POV rather than 10 second blasts.
I never really paid much attention this until I built a couple Olds engines and the guys who love those deals are always trying to fix the issues the large main bearings create...
Regarding using the small Honda journals...
Since I'm on such a tight budget with anything I build it's a no brainer for me to grind a crank down to 1.88 or 1.85 to be able to buy used uber high quality rods that are better than any of the import stuff and cheaper, too.
My late friend Jim worked for Roush racing for 8 years as a crank specialist. He worked directly with Lentz developing their Nascar stuff that they used in the Cup engines.
When I told him what these rods, Ti valves and bits were selling for on fleabay and other sites he jumped on the idea of using them in the hot rod stuff he was building on the side. He assured me 1,000 hp was a safe power level for these parts and, when questioned about crank overlap, he told me not to worry about it... it was a non factor in the stuff I was building.
My Pankl rods came from Richard Childress Racing as did the Ti valves.
I bought these rods for as little as $85.00/set and Xceledyne Ti valves for $75/set. Costs me about $60.00 extra to grind a crank down to 1.85 rather than .030 undersize... takes more time and material. The valves need to be shortened and grooved, too. About $12.00 per valve. They are 6 and 7 mm stems. Lash caps are required. You also need different material for the valve seats Because iron is hard on titanium valves.
And I need a custom piston too, at around $800.00 per my latest price quote. Because of my stroke and compression requirements I need those anyway so its a non factor.
So I wind up using rods that are as light as 540 grams (compared to 340 rods at 740) and pistons under 500 grams compared to the Ross that I have now @ 710 grams. Makes for a happier revving engine which I need.
The guys in this class I run have everything from 650 hp 360 spec motors to $40,000 850 hp RY45's. I need all the help I can muster.
You needs are likely different.