MF X-Can V3 mod help

[maddmaxxdrummer]

Hi I have been modding my X-Can V3
I was wondering about the bypass caps under the board.
Is it worth it ?

if yes, What type of caps should I use..
MKS OR MKP ?

What are the values I should use for 100uf, 2200uf, 3300uf..?

What are the values to bypass the PHE-426 Rifa caps with?

Also the 4 yellow stock bypass caps 1uf and 470nf ?
What type of caps should I use to upgrade these?
MKS or MKP..?
Should they be bypassed under.?
With what type/values..?

so far i have done all the PSU caps, output caps, mills resistor and uf diodes mods...

But now I noticed that on power up. When I plug in the wall wart, even with volume completely down, there is a fading in hissing sound and pop into both headphone drivers .
I don't recall this being there before
Is this normal?

Should I plug in my headphones only after the start up sound occurs? .. It's about a 30 second process..

I do remember on power down, a whining sound in the headphones which is not there anymore.
Is this normal?

Any help would be appreciated.
Thanx.