I always kept my Yorkie-Poo closely and neatly trimmed......about 1/8"...which only takes a few seconds with scissors at bath time, but Brody was kept, when I got him, with a bit of hair hanging downward directly from the tip and I have trimmed it a little shorter than they had it but left it there...about 1/4" - 1/2" long. The hair does actually curve downward toward the ground. The way Brody pushes his little hips downward and forward to pee, the stream goes in a perfect little downward arc and lands on the ground in a perfect mid-body place that keeps him clean all the way around...body, chest, legs, and paws, and he knows to step around, over, and away from his puddle.
My Yorkie-Poo lifted his leg...he was unaltered...so never had issues peeing on paws unless it was running downhill onto his feet, but Brody doesn't lift a leg or anything when he pees...it looks more like he is just stretching to sniff at something just out of nose-reach and if you didn't know he was peeing, you wouldn't unless you paid close attention.
Have you watched him when he pees to see what happens...how he gets the pee 'smell' on him...and where ? Maybe, if you knew that, you could adjust his clip or something to prevent anything getting on him when he pees. I am not opposed to wiping and cleaning them after they potty, but I prefer them to stay as clean as possible in these areas without human intervention being necessary whenever possible.
Oh, and if the stream is hitting other tummy or chest hair that hangs lower, clip that hair so it doesn't hang in the way and get wet when he pees. If he's just got a strong and proud stream and is hosing down his legs and paws, you're probably gonna need wipes every time.
Good luck.