Thanks for your advice. Will definitely give it a go to get me feet 'seasoned' to the QD PB 4.0 shoes.
One thing I notice on the QD is the upper is the structure is quite weak and floppy. Easily give way to movement. I can mitigate the toe injury when I use the PB3.0 without the insole. Not much of the impact on running shoes performance or comfort. But for PB4, the insole is glued to the shoes. Most super shoes' upper are like that to reduce weight and have more breathability. But Nike and Adidas so far so good.
It was only when this toe issue came on with recent time (coincide with super shoes introduction) that I began looking at my feet a few weeks ago. Both of my L/R big toes are slight bent laterally. It's like a very mild form of bunion which you see on most ladies, especially runners. Usually the cause is too narrow footwear for a very long period of time, eg. their narrow high heels all day in the office. Runners do get them too. Right now I using those cheapo toes separator from Shopee to wear at home, and hopefully can mitigate further degradation.