Is my seedling stretching/too tall, if so why??

Looks absolutely normal.

The node spacing is fine for this point. If it keeps getting tallen, react and increase light intensity. Simple as that. Take notes about timing and amount of power/distance you used and pre-empt any stretch next time. Stop watering like that. You are watering in some pre-ordained way that is not healthy. Under normal conditions... 1) water entire pot. If soilless you get 10% runoff or more to maintain nutrient equilibrium, with soil you want minimal runoff to preserve your amendments and ensure the entire thing gets wet. 2) wait for appropriate dryback and repeat. with soil maybe 1" deep dries and with something like coco when the top starts to change color. Simple... don't over think it. Don't let any OCD or whimsical needs affect this procedure. You do not have normal circumstances because you have a tiny plant in a huge pot. This causes all sorts of difficulties and raises probability of problems for no reason. Use appropriately sized pots for the plant's size in future. Yes, even autoflower can be potted up without any fear. I've potted up 400? some plants over 6 years and yet to see 1 plant get shocked from it. It is total bullshit that gets repeated by people that never questioned the anecdote that autoflowers shouldn't be transplanted. Nonsense. Only if you destroy the rootball like ar etard would you cause shock by simply placing a plant into a bigger pot and gently covering it with more substrate, lol. So... 1) water a diameter around the plant that is slightly larger than the canopy. Slowly increase the diameter as it grows. Ensure the water gets all the way down to the bottom of the pot. 2) similar to above, wait for appropriate dry back and repeat. By watering a smaller diameter than teh whole, you should avoid a pot with stagnating water for long periods of time. The rate at which the plant drinks needs to match pot size or it opens up risk to all sorts of problems and a total pain in the ass to water properly. If you don't do this, it will potentially cause weird root growth - superficial and less idea. You want it to dry in a consistent way in which the inner portions of the substrate remain wetter longer than the top portions. Roots turn toward greater moisture. This ensure the roots drive primarily downward. Superficial roots are not the goal. Erosion and compacting does occur and if any roots are exposed, they turn to useless stem and no longer absorb nutes. You really should feel many roots in teh top 1" of substrate if you water properly. A few hairs is find, but no substantial rooting should be near the surface if you water correctly. as far as overwatering, this is a matter of how the substrate is constituted. Overwatering should be impossible. soil/sphagnum peat moss type base should ahev 50% perlite or similar, i suggest vermiculite #3 because it also gives some silica. Coco needs 33% because it holds less water per volume. Both will hold roughly the same with these ratios, which is no accident. It's about an ideal gas to water mixture in the substrate. the only way you can overwater would be to quickly run endless gallons through it for 10-15minutes or more, lol. Nobody would ever water like that, so it is impossible.

Its a bit tall. This is from the lights not having enough intensity. You can move them closer or turn the knob on them up more towards 100% if it has a dimming knob. Plants will stretch more when it wants more light and they will be compact when getting to much light. but varies on the cultivar. You can monitor this by mesureing the space between growth nodes or the stem vertically between the sets of leaves. If you don't have any tent fans they helps the plants bulk up, the wind is like weight lifting. So the stem is less prone to snapping. Overall good airflow in the tent is key for plants as well.