Vincent,
Been flying one for the last two years on a Wren 54 mk III. I agree, use all the flaps you can get to help slow it down on approach. Just plan a low approach starting low in downwind. I found 2% up elevator mix with flaps, another 2% with the speed boards helps me setup a slow glide speed for approach, but be careful in the turns with this much mix, really easy to pull too much elevator and stall her. The reason for the seperate elevator mix with the speed boards is a little faster glide can be had, such as on gusty days, by just leaving the speed boards up. Note all these settings kinda of get dialed in along with the CG, nose heavy more elevator mix, less as you move the CG back. The T-33 is a CG sensitive airplane when it comes to gliding in for landing and its effect on the final flare characteristic.
Hope you enjoy the T-33 as much as I do, sweet flying airplane once you dial it in to your flying style.
And flaps on takeoff, nice for scale, but to me it makes a smoother, slower rotation on takeoff with no flaps, preferance issue.
Jim Hiller