Um, +29 at 28 is correct but that'd be vs 42 AC for even level (level+14). You'd hit on a 13+, vs an even level solo you'd need a 17+, and versus a +4 (for an e+4 monster, which is well within guidelines) you'd need a 21+ on the die... oh wait. Hell, vs a level+3 solo you'd need a 20 on the...