IMO it's just a mismatched unit. I would rather the compressor and turbine be capable of similar power levels. So if I have 750hp worth of turbine give me a 66mm compressor instead of less response from a 76mm capable of 1000.

69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700