Low compression on commando 273 with 13000 miles??

I tore down and rebuilt a 66 273 with egge pistons, commando specs and a comp cams 20-306-4 cam about 1 year ago. Recently ive noticed a bit of blow by and now it seems be running a bit sluggish over the last month and a half or so. I just did a compression check across all cylinders and it seems low but not entirely sure what they should be with that cam. I set the ring gaps accordingly so a little stumped no how its possibly worn down under 13000 miles.

1-135 2-110
3-120 4-120
5-118 6-115
7-110 8-120

Ive been working on a 360 magnum and the fact the its low has me worried about what i could have done wrong and what i need to do differently so this isnt a problem for my new build. Any insight would be greatly appreciated.

Thanks,
Jake