Help me do the math (mixed ohms/watts)

Use one of the heads to drive the HLF & the other to drive the combo of the other two; your choice of which amp powers which stack. Is that what you were asking?

 

Single stack? Likely the B2-RE and 2 x 410HE...
Or as tomB noted above, add the PF-350 and 410HLF to the side and for sure that would eb the loudest.

oops, I thougth I saw 2 410HEs...

 

If it was me, I would start with just the PF-350 into the 4 ohm HLF. Great sound, reasonable package size, probably enough loudness, safe and proper.

Then I would try to trade the B2RE and the 115 cab for a second one of the 8 ohm 410, as two of them together will be a killer way to get maximum great-sounding loudness from the PF-350.

 

Pf and one of the he cabs. Ditch the rest and get a second matching he cab if you need more volume.

 

No you can not use both of those cabs with the pf at the same time. Use the hlf by itself, sell the other head and one of the HE cabs, when you get a second matching 8 ohm HE cab, use two of those.

 

Maximum output and maximum sound quality are different goals. What is the end goal?

Max output is probably the more powerful amp with the two 8ohm cabs, assuming the amp is only good for 4 ohms.

Max quality may depend on having more output than you can get from the hlf and your favourite amp, or whichever single cab and amp you like.

All the gear is readily tradeable, you could easily build another ideal rig without ever being without a gig rig.

 

Alright! My >40 years of technical experience says...The B2-RE with the B-410HLF. Amp with most potential power coupled with bottom that can take it!

 

I think it has more to do with tone. In my opinion the PF sounds better than the BR. The HLF is also not the cab for me tonally. I would prefer the PF and 115HE, and I would sell the rest to fund a second 115. The PF-350 with two 115HE cabs would be a killer little rig.