MK3 supra gets a walbro 450 upgrade for 2JZ GTE VVTI engine swap

Originally I installed the 255 Walbro hoping it would be an adequate upgrade from the original style fuel pump. With the equipment in place, including larger lines and an adjustable fuel pressure regulator, the 255 seemed to fall flat on its face at about 43 psi.After doing this video, I tested the system again and Im easily reaching 60 PSI now. Thats all I tried ,so it may actually be capable of more pressure. I'm using a rate of rise regulator and planning on setting it to increase pressure by 1psi for every pound of boost that it senses from the manifold. That doesn't seem possible with the 255 since it wont make more than 43psi, which is pretty close to the idle pressure required for 14.7:1 AFR