It's late summer here in St. Louis and temps are hovering in the upper 70s/lower 80s. So the past 4 days I have been carrying the P30L under short sleeved, unbuttoned shirts in a Muddy River Tactical OWB Kydex holster with a double mag carrier on the support side. I have the holster adjusted for maximum forward cant. I was with people who should have noticed, yet no one did. And hands down these are the most comfortable holsters I own. I've had the HK on the range with this set up and it is not only very comfortable and very concealed but very accessible.
A couple trips to the range now with the HK. I have put about 450 through it, just about doubling the total round count through the gun and not a single flaw. Running WWB, Blazer Brass and HST ( 124 Gr.). I'm getting very used to the trigger. It is different and although I am very comfortable carrying it I think I'm going to avoid carrying other guns for awhile since it is so much different than all the strikers I usually carry.
Thanks to @SimonRL
and Kevin at Muddy River Tactical I think I have my new fall/winter/early spring rig.