Hi and welcome to coffeesnobs :) Hopefully youre genuinely on the path of looking for the perfect coffee and not just flogging a brand name ;)
Ive never seen inside a Saeco, nor owned one, so Im a little confused about your "mod". Usually the basket is pressurised, not the portafilter, by pressing two pieces of metal together - the upper with lots of holes and the lower with one hole. If you removed a spring in the portafilter I dont understand how this would un-pressurise the basket.
But I would love to see photos (as would others here) of the pf and basket to show just what you mean.
Id also have to say that 1mm of crema is a bit thin - does it last more than a few seconds or does it dissipate? Hopefully with your Sunbeam youll get an even better looking and tasting shot :)