I must say I have been lucky to not have too many issues with the horizontal tail section. During that phase of the build initially I didn’t have the big reamer needed so I only lined them up, clamped them together and laid out my rib locations. I never actually tried to connect them again until I put the horizontal stabilizer on the fuselage and then attached the elevator. I did have to wiggle things together a little but by that point I had already reamed them, inserted the bushings and bearings. A clamp was necessary on a few of the bushings while I inserted the bolts, however after all was in I did have pretty good range of motion. I wish you both good luck going forward and that there will not be a need to have them removed and welded on again.