Speaking from personal experience, those breadboard blocks you're using are a sod for crosstalk. I've long since given up using them, as every circuit I was inerested in building on them simply wouldn't work because of the parasitic capacitance or inductance of the things.

Also, stop finding useful toys and posting the links! I've just finally completely paid off my credit card, and you go and tempt me with a decent scope at a good price

pca