Your at 27" now with your compound, you will more then likely be an Inch or so less with a traditional bow. Everyone usually looses an Inch or so when going from a compound to a traditional bow whether they shot with a release or not with there compound. Some people don't loose any draw length when switching but most that I've seen do. Some will even loose 2" of draw length. When I shot a compound my draw length was 29" and I shot fingers. My draw length now with my recurve Is just a tiny tad under 28". A 28" standard will do you just fine. As for tuning a traditional bow, you bet they can be tuned. Brace height, nocking point on your string, etc. Sounds like your going to start off light In draw weight which Is a good thing. What kind of arrows you want to shoot?