hrmm.. my guess would be that the problem is not with the cams, but more with the valves, or valve seats. I have seen valves tulip when they get really hot, which ends up causing the valve to get longer (it actually pulls the stem, which attaches to the head of the valve inwards)... also the valve seats can wear out (not as common, essepcially with the super hard mitsu seats). Also cutting your valves, or valve seats will also increase the "installed" hieght of the valve. aesnd you have to compensate for this by grinding down the end up the valve stem down to get the correct insalled hight. thing is you cant grind too much down so it eliminates the "margine" (tapered bit at the end of the stem) I have also seem people grind/machine the bottom of the lifter body down to allow for more clearance as well. Doug Almond did this on his 2G when a valve had been regound a bit too much, and he had the same problem as you. (valve wasnt closing) It worked great AFAIK.
All these things will cause the valve stem to sit up higher inside the valve cover and once the cams and lifters are installed, the lifters have only so much "slack" and they will bottom out and the valve wont close.
By putting in regrinds, it aleviates the problem of excessive installed height, due to the low point in the lobe being grinded down.... thats probably why the crower 272 make the valve open, and the regrinds didnt.
I remember you having problems with lifters ticking really bad, which you ended up fixing my shimming the lifters, but not ALL the lifters??? these seems wierd.
I would check the installed hieght of the valves in the head... i bet you will find that a valve in cyl #1 has excessive installed hieght... which is why the valve wont close
now just to confirm... you did remove all the shims under the lifters before you installed the crower 272's right???