5 or 6 raw tpa is quite a lot to be stealing runes and gc. Personally, when I run a/t/m, I'd run more like 3-4 raw tpa, 4 raw wpa and that gives me enough space to also have a decent army (depending on the race set up etc, this age is not in my view one of the strongest ages to run a/t/m). Having good sciences would be important to make that work well.

However my numbers aren't the only way to do it, and how you set it up depends largely on what you want to be able to do with your offence. If you only plan on finishing chains or hitting low def provs, then what you have can work as you don't need a very high offence. So a large part depends how your set up will fit in with your KD strategy.

Given that you are heretic (with bonuses to thievery and magic) it does make sense to try to use both thievery and magic, so I wouldn't necessarily say give up on a/t/m entirely.

But if you want to run a/t or a/m then just reduce the thieves or wizards accordingly. Personally at a/t I still wouldn't normally run as high as 5 or 6 raw tpa, but some people would so I wouldn't say it's wrong (nb I would personally use TDs though so that boosts my mod tpa). Remember though you only need enough tpa to do what you want to do with it. So if you are planning to op enemy attackers, then you only need to be able to beat their tpa by enough to allow you to do that.

In practice, some of the decision may be made for you. For example if you lose more wizards in the next war, you might need to go a/t for a while whilst you re-gain wpa.