i would continue as you are doing. when i first started quilting years ago i did the same as you. then i read in quilt mag articles (where i basically, learned to quilt) that there was no need to back tack as the stitching lines of added patches would secure all. but for tied quilts i would back tack ..for the same reason as you. it will make them more sturdy. especially if being donated to shelters, homless etc where they will be subjected to rough, but appreciated, usage.