Answer the second one first. Trigger is holding alot of weight and not like a rifle. All crossbow triggers have some creap. They are not to be played with and rebuilt as rifle triggers can be. Maybe gummed up and you can spray it with WD-40 and other than that for saftey it is likely better to leave it alone.

You can use same points, broadheads as vertical, but generally crossbows like a little more weight forward. A 150 grain head is generally better than 100 grain. I run 100 grain heads but have 110 grain brass inserts infront. Check the manufactors weight minimum on arrows and don't go below that. All crossbows have a minimum weight of arrows.

Hope this helps