you should be able to sit down and move comfortably in your suit....the problem with making suits is everyone is built different...its sounds to me like you need some length added to your torso area....
ANother problem i run into alot is measurements being off..we add room to areas of the suit for bending stretching sitting etc... if its tight the measurements were probably off.....Please dont take that as its your fault thats not at all what im suggesting...I make mistakes as well it might have been my fault as well...what I would suggest is lmk what you think after you wear it a bit and if you feel you want that extra room id be more than happy to fix it for you...after all fett needs to sit and have a break and slop some grub...who wants to relax or eat standing up...