Yeah, about pH 4.
The gelatin should help keep it from coming apart for a while at least. More so if there's glycerin or water present in the gelatin.
LSD stored in gel tab form (containing glycerin) at room temperature is very stable and lasts many times longer than LSD stored on blotter paper.
The reason most people find LSD gel tabs to be "cleaner" is because it takes longer to degrade so the tabs stay fresh longer. The effect of "unclean" acid is usually just the effects of degraded acid. Acid decomposes into other active alkaloids, and so as it ages it loses its "magic" and starts taking on a more mundane effect. In this way it's sort of like LSH. LSH degrades into LSA. LSA is just a sedative. LSA further breaks down into other alkaloids, but I don't know what they are. Very old LSA that has decomposed is quite unpleasant.
The idea is that you want to keep the LSH from vibrating apart from the acetaldehyde. In heat, the acetaldehyde wants to vibrate and break free and vaporize away. Acetaldehyde boils at room temperature and so it's best to keep it at room temperature in liquid form, otherwise it just forms a gas and floats away. Sort of like hydrochloric acid which is just a mix of hydrogen chloride and water. The water keeps it from vaporizing away. Without the water, it forms a gas and floats away. The water slows this action down a lot, but doesn't prevent it from forming a gas. Acetaldehyde is very similar in this way. It will stick around when in water, but not when dried.
When you make gel tabs, they normally contain a little glycerin, so they are actually a gelled liquid. Acetaldehyde in gelatin that has glycerin in it should not vaporize away so easily. The glycerin will keep it "dissolved" in the gelatin. This is why most gel tabs contain glycerin. It acts as a stabilizer for many compounds that would normally just vaporize away.
Glycerin is a great thing for this purpose. It evaporates very slowly compared to water and so it should give your gel tabs a really good shelf life.
When making gel tabs for LSD, people add vitamin C to prevent oxidation, and they add coloring to prevent the LSD from decomposing from light, and they add glycerin to help keep the LSD dissolved. When LSD is dissolved in glycerin, it's protected from the outside elements by being surrounded by the glycerin molecules. The glycerin acts as a shield.
The main thing here that you want to focus on is that LSH is said to be more stable in solution than when dried, because of the acetaldehyde it contains. So adding glycerin to the gel tabs keeps the LSH in solution long after all the water evaporates away.
Take a look at some gel tab recipes that use glycerin. I think this is a great way to make LSH somewhat more stable. I think probably a properly made LSH gel tab would stay effective for at least a few months, whereas LSH powder would probably only stay effective for a few hours. Glycerin would keep the acetaldehyde from vaporizing away, and even it if broke free from the LSA, the acetaldehyde would stay in the glycerin for a long time and might even reform LSH in your stomach when you ingest it.