Yes, I got this information from your previous post already.
What about the RC time constant? Did you lower it?
Besides this, you have to be careful to transfer simulation results - in particular loop gain simulation using the L-C method - to closed-loop conditions.
In many cases, the L-C method works sufficiently - however, this simple method has one drawback: In closed-loop operation the opamp input resistance is in parallel to the capacitance and, thus, changes the phase function. However, in your loop gain simulation scheme hte capacitor is NOT loaded anymore.
This "loading error" (deviation from real conditions) may be responsible for the effect you have observed.
Note, in particular because of this error Middlebrook has developed another (more complicated) method for CORRECT loop gain simulation.