ah, I’ve cracked it.
Ive realised its not the frets, Its just the overall neck shape and size.
See I realised with my P Bass my hand cups the back of the neck, it fits like a glove, so my fingers are free to move without my whole hand moving. With the P34 being a bit narrower my hand extends further away and so my fingers need to be curled a bit more, and the hand is more floating rather than cupping the neck. Some would say bad technique, and I’d probably agree, but it’s how I play. Its still a fast neck, but when I’m standing my fingers are curled even more. That’s where the lack of comfort is coming from. this also accounts for why I like playing 5 string, as the neck is a bit wider, but the sting spacing is normally narrower.
Got a gig on Sat and I’ll take the P34. Might as well get a proper gig out of it before it goes.