I believe those caps are made by Solen, which are known for being harsh.
Depending on how much you want to spend, Dayton caps aren't as harsh, but are still forward in the highs. The next step up from there would be Sonic Caps, which are very neutral. To save money, you can use Sonic Caps on the highs and Dayton on the lows.
Yes, these caps are Solen, in fact I'll be trying bypassing the caps with .1uF caps as suggested to start off with and yes, I'll try and do that with Sonic Caps.
Thanks much
