Experimental is an all or nothing proposition. With a PPA system it should be possible to keep most of your system on stable, and opt into newer versions of software on a case by case basis.
"WARNING: Use of apt-pinning by a novice user is sure call for major troubles. You must avoid using apt-pinning except when you absolutely need it." https://www.debian.org/doc/manuals/debian-reference/ch02.en....