I've flown the LT-40 and the Four Star 60. The Four Star would float in almost walking speed on a landing, and was very easy to manage. What you should do is fly what you feel comfortable with and gain more experience before moving up to more advanced aircraft.
If you don't feel the larger plane is a benefit, back down to a .40 again. Personally bigger is easier for me to fly and see. They resist wind better too. As stated earlier, adjusting your rates, and have dual rate radios, its the best way to adjust upward, where the radio compensates for some quick responses some planes have moving out of the trainer level. Exponential is a great tool to also use, while still having enough rate to get it out of a turn/dive/trouble at any speed.
I recently flew a few .25 combat series Great Pains ARFs and had a blast with those, especially going back to hand launching a small easy to transport plane. The 25 FX screamed and kept up with the faster planes in the air too. I had no trouble with it and due to it's speed, I was flying the same pattern as the .60 sized planes.