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Mury, I haven't been on in well over a year but today is your lucky day I guess.

The issue is not likely the Malossi Multivar. I too have that with 6g rollers and the white spring installed. Your issue sounds more like an engine issue. The Malossi is an improvement over the original variator in nearly every way. The 6 g rollers should give better acceleration as well, and the white contra spring will provide an rpm increase as you hit hills/slopes. This should increase your climbing speed.

From the sounds of it, trying to understand what you're saying, the engine seems bogged down. This is not related to the variator. I have had many issues with stale/bad gas where the scooter just does not want to run hard and bogs down continuously. There could also be an issue with your carburetor being clogged up or dirty that would cause this. Another issue could be your valves are out of spec (not likely) or your spark plug is shot.

Your scooter will always lack power when not warmed up. It will be even worse in cold, wet, humid conditions.
You must be sure to let your scooter warm up for 2 minutes or so before you ride it. You should do this every time whether its cold out or warm out. If you start the scooter and ride it hard immediately you can hurt you piston/cylinder and lose engine power over time. On a cold engine the piston is smaller than the cylinder and there is little oil on the cylinder walls. This can cause blow-back which will gunk up the walls or worse you could score the walls due to lack of oil lubrication. This wont happen right away but over a period of time of not letting the engine warm up these issues can occur.

First I'd start by letting the scoot warm up before driving. Next I'd add some fuel stabilizer and carb cleaner to your gas. You can find some products that do both in one bottle. If that doesn't solve it then dig into the other things i discussed.

Hope this help.