It really depends on what you consider 'fluffy'.
For a typical Hunter Cadre however, a good rule of thumb is the less battlesuits, the better. Contrary to what more recent GW marketing might have you believe, in all but the most recent of background material battlesuits are a rarity. The bulk of a typical Hunter Cadre is teams of Firewarriors, often mounted in Devilfish, backed up by some grav-tanks with a few Battlesuits in support.
It's easy to get caught up in the glitz and glamour and giant robot imagery, but at the end of the day Battlesuits are supposed to be an elite few - the Tau equivalent to Terminators, if you will. Indeed, Battlesuit production is carefully regulated and heavily restricted by the Ethereals to ensure that the only Shas who receive them are worthy and can be trusted to act in the Greater Good (it's not unknown for the power afforded by a Battlesuit to go to one's head, a phenomenon called Battlesuit neurosis). Suit-heavy forces are therefore the exception rather than the norm.
Thus, for a more lore-focused army, consider the following:
- Lots of Firewarriors for troops (preferrably tried and tested pulse rifle and carbine wielding ones, but breaching teams work too in a pinch).
- High mechanisation.
- Just a couple of Crisis Teams and one or two other kinds of Battlesuit.
If you're going with an Enclave force, it may also pay to consider older background. Again, all-Battlesuit Enclave forces are, believe it or not, almost entirely a product of late 6th edition. In earlier background the Enclave Tau were essentially a guerrilla insurgency force - they weren't as well equipped as Empire forces, but they made up for it with training and skill, especially in close quarters. This was reflected in Enclave armies having restricted access to most Tau army list options (Gun Drone squadrons, Ethereals and Auxiliary units weren't allowed to be taken at all, and you could only take a maximum of 1 unit for everything else except Firewarriors, Devilfish and Crisis Teams), but in return gaining the ability to upgrade their close combat stats.
Thus, if you're looking for a different flavour of background-focused Enclave force, consider the following:
- No Auxilliaries, Ethereals or Drone Squadrons (outside of squad upgrade Drones in 8th).
- Only two selections each for Fast Attack and Heavy Support, with no repeats (so two different choices in each category). This was in practice the net result of the Enclave restrictions in the original 3rd edition Tau army list.
- A maximum of just one Stealth Team, if any.
- No large (I.E. above Broadside size) battlesuits. Such advanced and heavy equipment is in limited supply and not available to your force. Your daring Enclave fighters will have to make do without them.
Post-6th edition background has added some other elements in, like more focus on battlesuits, but the above points should help you if you want to field an army closer to the original classic Tau background.