I'm not Jim, but here are my 2 cents: There is a major difference between a steel string acoustic and a nylon string. Also major difference to an electric. You cant expect the steel string acoustic to have that kind of low tension. I would suggest two options: (1) put on 12 gauge strings and detune them 1 whole step. This will give you the fat tone but a lot less tension. (2) get a short scale acoustic guitar, this will have a little less tension.
The final and best option is to train your hands to play at higher tension. Do this slowly, perhaps with the help of a teacher. Best of luck!