Help Tweaking Aircraft

I'm not sure if this is right forum to post this in, so jere goes anyway.Recently installed the Catalina PBY "Flying Boat" by Abacus, also "Vietnam Air War," by Just Flight, without any trouble, but have noticed a couple of things I hope someone out there could help me with.Both the Catalina and one of the "Vietnam Air War" aircraft, the Fairchild C-119 "Shadow" gunship, seem pretty underpowered. I understand these things were not meant to be "fast movers," but they seem like they both need a LOT of runway before reaching takeoff speed. Have checked all the obvious things like prop rpm, flaps, etc., and wondered if there was something I could "tweak" which would give them a little more get up and go?Also, I have noticed with a couple of my "add-on" a/c that the radio callsign is prefaced bt "experimental," i.e. "tower, this is experimental C-FFR with..." Is there any way to alter this also? What file do I go into, and where is it located???Still learning my way around PC's-so this is all part of the learning curve for me!Best regards,Joe Denoyer