Lowboy, do you use an amplifier or feed into the house system from your setup. I think you mentioned that you run a 10″ JBL is this a powered box or do you have a separate amplifier. I used to use a Masteroom XL 305 spring reverb unit that I bought new in the mid seventies but about a year ago I started to down sized and just use a cathedral pedal which I am not all that happy with but it works. I have use a Traynor K4 amplifier for about 6 years now that works great for my keyboards but not very good for my melodicas (Hammond 44) and run a mic for my vibrandoneon and Clavietta through it for small rooms. The Masteroom reverb unit would probably make a good match for the sound you are looking for.