Hi, I'm new to DIY world so I'd like to start with a kit and the Crack caught my eye. Since is an OTL amp It does not pair well with my LCD-X. I'm looking for advice on what parts change/add/remove to make it more powerful on the 20 ohm region. Also I'd like to add a second pair of RCA variable output to use it as preamp. Is something like that possible having the Crack as a base?