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Isobaric or not

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Hey, Looking for an answer to this. I have a tuned (32HZ) ported box with 3 Rockford Phosgate 10" running approx 750w through them at 3.1 ohm.

I have a 1ohm stable amp and want to run more power through the speakers . Each speaker is rated at W250 RMS. I have run the same box through a speaker box program with using Isobaric (clamshell) design and all looks good, even improving the curve a little on the low end. 

My simplest upgrade would be to buy 3 more subs of same type and install them in a Isobaric clamshell configuration. I would then wire the speakers to configure a 1.33 OHM load. This would (on paper) produce 1500 W RMS from the amp.

I would like to go this way as it would be the easiest upgrade.

My question is which would be louder...  the 3 isobaric clamshell in exsisting box or build a new box with proper specs having 6 10" (same speakers) under the same 1.33 ohm load (1500W)

Can anyone clarify this?

thx

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If you have the space for a box for all six subs, do that.  Isobaric cuts your efficiency in half.  

Another possibility, if you have enough space for a box for six 10", sell the three you have, buy two 750 watt 15"s and you will be that much better off. 

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