I’ve successfully infused several parts with a venturi pump from Matco and a squeely air compressor. My hg was between 16 - 20. I was worried at times, but I had no problems. For me 25 - 29 is the sweet spot.
The panels I was infusing were about 8" wide by 30" long. The laminate was made of 6 layers of 2x2 twill 6oz carbon fiber.