Overpowered Mages and my complaining players, How can I fix this? Options

[FrostyNSO]

I have been GMing my group for a few years now and though we've tried rotating the GMing duties every once in a while, it seems the players just like it better when I GM.

Well I moved about 4 hours away and so I've been coming down for a monthly game lately. During my "off-weeks" one of our group will GM a run for those guys while I'm away.

Before this guy would ever GM, and was just a player, he had already bought all of the books, and would often call into question certain house rules I had implemented to speed up the gameplay when neccessary. This guy insisted on sticking to the rules no matter how much it slowed things down or (some say) 'ruined' the moment.

Anyways, this dude when he GM'ed had given 'my' players access to a clearinghouse-type place (similar to crime mall) which also sported a Delta clinic. He gave them unrealistic NPC's that would supply monofilament whips and heavy weapons. Allowed the players to purchase 1000's of rounds of anti-vehicular ammunition from the crime mall. Paid the players huge sums of nuyen for token runs. And this is things the players got access to after 1 or 2 runs! I have always tried to run a 'work your way to the top' kind of game, where the players had to use their contacts a little more, do more footwork, and when violence was required, to do it in a professional manner. This other guy has blown that all to hell within a few gaming sessions.

Another big thing we've butted heads on is magic and drain. A long time ago, when the group decided mages were a little overpowered, we deviated from the rules in the book (1/2 the spell's force used when calculating drain), and instead decided to use the spell's whole force for drain resistance. This had worked wonders and helped to control players (and NPC's) with boatloads of high-powered spells, without having to crank up the opposition and kill off the weaker members of the group. This guy has 'overturned' this house rule when he GM's and now the players with magic complain when I have them take drain at full force.

The the other players have described this guy's style as 'By the Book'. How can somebody that is by the book offer the nuyen and resources to the players that he does??

I have been able to mitigate his 'damage' by not having certain contacts answer their phones (it goes to voicemail or something), this delta clinic is always locked down with nobody 'home' (this has only pissed off one person), and I've made the players take some 'lower' (but not cheap) paying runs and made them work a little harder for them. But this magic thing is causing huge problems. The players who don't have magic think the house rule is reasonable and they have used mages before also. It is the people playing mages now that are constantly questioning my GMing and mr. by the book is still jumping in to tell me how to run my game.

How can I remedy this situation???