Since you edited your post to sound less cunty I'll remove the opinion I posted in the opening line, but the rest still remains valid. There is nothing wrong with experimenting with tuning.
A=440Hz tuning has no real meaning other than it was, in 1955, deemed to be the ISO 'standard'. Prior to this there were various accepted tuning standards, including A=425 and A=435. This includes the period of history that covers most of the great classical composers, all of whom may have adopted slightly different preferences.
Mathematically, if C is tuned to 256Hz (A=430.54), then all of the corresponding octaves fall on exact integers (no decimal points), so there is some mathematical basis for desiring a tuning close to 432.
Some modern orchestras, including the New York Philharmonic, do not accept the 440 standard and tune slightly up/down.
'Harmonics' are just that. The definition of the term is a precise multiple of a frequency, so yes, retuning does have a tangible effect because frequencies are all relative. That's why our accepted harmonic scales/chords sound pleasing to the ear - because notes are separated by precise mathematical intervals. Retuning essentially has the same effect as speeding up or slowing down the whole record, everything is still relative.
440 Hz is widely used as the tuning standard for western music, but 432 Hz is on the rise. Why is this? And which standard should you choose?
www.izotope.com
Take a seat. There are lots of meetings involved.
www.wqxr.org
On topic: You should now focus on your percussion, liven it up with some velocity adjustments, panning, additional layers, fills etc.