Just wonder if a 75cc edge 260 is a reasonable IMAC plane for up to intermediate level competition. I am currently flying an AW 75cc and found it is a little bit hard to slow it down to allow a constant fly style. Power is da85 with 26X8 Xoar prop.
Yes it is. The prop is part of the problem for not slowing down. I'd bet with that prop it's a decent 3D plane and extremely loud, but for IMAC I'd do a good Carbon 27x10 2-blade or a 25x12 3-blade such as a PT models or Mezjlik, both can be bought from Troy Built Models.
Now I'll address the question of Intermediate. If you have not flew a contest yet, I would not start out in Intermediate, I know you did not say it that way but in my experience, most people asking this type of question are considering starting out much higher than they should. Don't let the Basic sequence fool you into thinking you are a better pilot and can handle more complex maneuvers. Doing the maneuver correctly is only part of the total score for each maneuver, Don't forget about wind correction, tracking, proper snap and spin entry, is the 45 degree line actually 45 degrees and probably the most important thing, can you fly a perfectly horizontal line at least 500 feet in length that keeps the wings perfectly level, the plane will not climb or descend or yaw in or out. You would be surprised just how many pilots cannot do that. Also, you have unknowns to deal with in every class above basic, these are sequences you cannot practice with you plane or a simulator before hand and are harder than the knowns and get even harder as the season moves on and finally is the plane properly trimmed beyond the trim tabs on the transmitter. You do not need to go through a proper trim setup but it really helps as it takes loads off of the pilot and gives you a plane that is very predictable in any type of flying, even one that flies well now can be made better. I've never seen any plane not need some time of trim work like thrust angle changes on the engine, especially if you change props for different types of flying, and also setting mixes in the radio to eliminate KE flying issues
IMAC just put out an excellent online judging tutorial. I suggest everyone go look at it. While it is geared for judges, every pilot should know what a judge is looking for so that the pilot can present each maneuver as it is supposed to be