Wow i never ran into anybody that did so much fixing to a plane like that. That really shows that you got some abition and perseverance to learn to fly. I think you could be someone who can really take this wonderfull hobby somewhere.
Im the manager at the local hobbytown in Manassas and all the people who purchaced these birds fly them a acouple times and then later toss it in their trash bin or totally forget about them, as they collect a inch of dust in the corner of the garage. You mention the word modify and or fix everyone runs.
Well to your question patnchris pretty soon all the weight added to that plane will really start to show its ugly head after a while. You can try to fix it again and hope it flys again or try your hand at the local flying club and get your feet wet with a 4 channel bird on a buddy box. Someone who did all that to try to tame the RC bug needs to advance.