Results are in, posted them in the duramax blade post in more detail. But with the 16" electric fan running, after 10 minutes idling in 102°F it was down to 38° in the center vent and 40°F out the far left vent. A/C pressures were 255 and 39. Van was an igloo at that point, switched the 16" fan off. The pressures slowly increased to 275 and about 43. The center vent rose to 45°F and the left vent about 46-47°F. That is still 10°F or more better than the stock van did with R134a, vent temps would have been around 60°F with the stock fan, stock condensor, stock compressor and R134s. I turned the fan back on, idled it up to 1,350 rpm and after 5 minutes the center vent had dropped to 36°F at which point the compressor cycled. Pressures where about 250 and 30 when I looked a minute or so after the compressor cycled and the low side was slowly decreasing. I think it is cycling at about 26 psi.
Left vent after 10 minutes with the 16" fan on.
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AC pressures with the fan on
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Center vent after 10 minutes with the fan off.
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Pressures after 10 minutes with the fan off. Electric puller is knocking 20 psi off the head pressure and a few psi off the suction pressure.
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I will also add, I have yet to re-install the accumulator blanket so it is just soaking up engine compartment heat. I tore the old one trying to remove it and have a new one on order. Last time I replaced the missing blanket the temps dropped 2-3°F at the vents and it knocked about 2-3 psi off the low side reading and about 8-10 off the high side. I think I can get it to idle at around 35-36°F out of the vents.