Dominance is going to be decided by the individual matchup. A strain that is not dominant when crossed with gene pool X may not necessarily produce similar results when applied to gene pool Y. Because traits are likely controlled by multiple alleles, you must decide what traits you want to move forward with and understand it is give and take. If you just want one certain plant preserved in seed, selfing may be a more valid consideration; once you outcross you really don't know what you will get without growing them out. Finding a male, recessive for the traits you like in your clone, from an IBL line may get your backcross there quickly