monkeycloud, from my experience I definitely wouldn't go high with the Intensity. That's a way to make your light settings be completely unpredictable. I think I've rendered as high as 1.2, but normally I think you want 1. If that doesn't let the IDL spread enough light around, you can up the IDL bounces (although I would think with 7 you're going to be reasonable in that department).

Mesh topology does matter. If you have concave vertices somewhere, Poser definitely doesn't like that.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3