Upgrading coupling capacitors on EAR 834p

I have just got my first 834p and immediately loved its sound.
However, being kind of a diy freak, I want to start doing some upgrades to see how high it can go.

I am thinking to start from the C1 and C7 coupling caps which are pretty straightforward as a replacement.

From Thorsten's guide, I got some tips on what caps to try, but what strikes me as weird is that most of the tinfoil caps proposed do not come in the exact values that the schematic specifies (1uF and 0.15uF).

I wanted to ask how critical is it to maintain the exact values for C1 and C7 (eg using 0.1uF instead of 0.15uF).
And how would it affect the behavior of the proposed capacitors if I used 3 or 4 caps in parallel to match the 0.15uf value.

Here is the link to the guide for easy refference.
http://db.audioasylum.com/cgi/m.mpl?forum=vinyl&n=108318

Thanks in advance