In my younger days I used a handpress from LEE. I figured that, I could load ammo at work during lunch and/or breaks. It worked for me, using straight lube, the handpress and brass cased cartridges. But, I quickly found that it was a PIA. Too slow, for my taste.
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Anyway, IMHO.........the problem might have been (taken all together):
1) Lube cut w/ alcohol.
2) Hand press instead of a regular bench mounted press.
3) Steel vs. brass cased.
Perhaps, a slight change will give better results? Imperial wax or other straight lube?
IMHO.......keep the steel cases for when you have that bench mounted press. And BTW.......some bench presses are better than others for the "heavy" work. Meanwhile, use only brass cases with the handpress.
Yes, you do get quite a workout. That's the upside to using it. Over the "girlie men," who use a bench mounted press.
Aloha, Mark
PS.........BTW, those three steel cases.........did they chamber OK? IF they chamber, you could continue and build up those muscles. But, I feel they should be looking like the cases in the pic from SBR7_11.