1) Please read my tuning tips pages, especially the Structure Theory page and that will help with the suction discussion.
2) Regarding too much wax, a simple solution is to buy a nylon brush and after you get it from the tech you tipped, brush it. If wax still comes up, then the board wasn't really done. You have to get that wax off or the snow will grab it.
3) My wax is better than Zardoz but you will never get a tech to use it and you can't use it without an iron. Furthermore, the word I heard on Zardoz is that repeated use clogs up your base.
Seriously, For under $10 you can get a Maxx Waxx can, a polishing/buffing cloth (RC-2360) and keep that in your locker. When you get there rub some on, let it sit, get your boots on, then before you go our buff it on well with the cloth, a final brushing would be good but not critical because the excess will wear off quick. You won't have to bring it into the shop as often and it is cheaper than Zardoz.