Enspell 2 should work on multihit attacks (and offhand) as enspell 1 does, the bonuses from enspell 2 are inferior and so almost everyone uses enspell 1 over enspell 2.

Enspell 1 is overwritten by auspice and among other things and makes it annoying to use, making enspell 2 work in the same way enspell 1 works would make the spells far better for most red mages and would be a good QoL improvement.