Its anecdotally been proven that tapering doesn't really do much good. 100mg of test enth in my opinion isn't enough. Try something on the order of 250mg. Run the test out 2 weeks longer than the deca to aid in recovery. You absolutely need a PCT to quickly restore natty levels.
All that being said, magic32 is right.....you aren't asking for anything that can't easily be accomplished without AAS.