The negatives were a bit thin so maybe next time give it 12 minutes.
I'm going to suggest that judgement about the thickness and your decision to adjust your time may be misguided.
I like the shadow detail in these David. What speed did you rate them at ? They look really well balanced between the highlights and shadows.
Yes, I was wondering the same. Excellent shadows and highlights held good too. Of course there is scanning involved here. John W
You and John and John have all said essentially that the result is just fine. No problem with the print/scan was identified.
What I'm getting at is that negatives aren't supposed to look good, they are just supposed to carry the info from the camera to the enlarger or scanner in a way that works well.
Seems to me that, that is exactly what happened.
So, ColColt, if the negatives are already doing exactly what you want: why would you make a change?
I used ASA 250 as has been my usual with Tri-X and I just carried that train of thought over to HP-5. I've begun using it whether it was a day like those pictures were taken under or a somewhat overcast day. That little extra shadow detail is desirable to me.
Back in the day I would use ASA 400 on cloudy/overcast days and ASA250 on more contrasty days but have changed my thoughts these days about that. I hate blown highlights.
The way that you are shooting, it is unlikely that you will "blow" the highlights on the negative, HP5 has plenty of exposure latitude.
When you print via an enlarger to a fixed grade of paper adjusting film development matters.
Extra film development changes the steepness of the film curve and can make highlights "blow out" on the paper but the detail is still there on the negative fully available for printing. If you choose a higher contrast rate, extra film development, all you need to do to get that detail to print is "burn it in" a bit.
So if you are using enlarger and paper you would be making the possibility of blown highlights in a straight print more likely by adding more film development time as you suggest in the OP.
That doesn't seem to me to be your goal.