I am 165 Dende at the moment. I will share my thought's with you
Basically in my opinion there are few things that you should have in mind every single time when you decide to go hunting (either solo or with your team mates).
Exp Boost - if you are Premium User (having an premium account) exp boost will gives you 50% EXTRA experience points for first 2 hours, which means it's smart to hunt when you have full "stamina"
Waste/Profit - before you will go hunting, you need to think how much money you want to spent. Obviously there are respawns that will give you a LOT of experience points, but your waste will be higher, and vice-versa (you can get less exp, but more money in items then you used for senzu)
Think about Dende (as a support for your team mates). We are very. very very underrated. A good Dende can restore your HP, KI, and most important - have passive that will increase your Ki regen by 2% every 2 seconds. And he can increase DPS damage by a fair amount of percentage as well.
Finding a proper people to play with. I totally understand that you have Buu, Trunks, and Vegeta but it will be more efficient if you will go like Buu, Trunk/Gohan and Dende (for example), due to higher sustain/utilities.
Having a proper equipment. The thorn in eye for every player.. The dream EQ would be Less DMG from monster (%) for x-type of monster. Those items make Tanks immortal. For example if your Buu can have 5 items with Less DMG from monster (%) for Toxic Spiders, he can obtain up to 150% of dmg reduction (please note its not calculacint like 150%, but more like -30%,-30% etc). From the other hand, you as Vegeta, or your Trunks friend (more preferable for DPS to have this kind of items) can wield More DMG to monster. It's really something. For some kind of comparision - my friend which is 190 trunk can hit for almost 9k with dende buff and his items. THIS IS VERY HIGH DAMAGE
Return of The Saiyans have their exp rate system, which means there are few "gates". I am having 0.5x exp rate at level 165. You can check yours using command "!serverinfo".
Choose a good spot for hunting. Specially for Team Hunting. I can share you my 2 favorites spot's, if you don't mind that you will be not able to earn a lot of money
a) Fallen Angels in Hell - if your Buu friend are able to sustain Fallen Angels, then with pills you will be able to earn 2.25 KK exp/h. I was here at level 130, however my Piccolo was around level 140. Additionally we had a Gohan.
b) Shamo - its hard to describe where it is, but if you will pm me I can show you this spot as well It's basically my favorite spot in the game at the moment. Thanks to this spot I am able to get 4-5 levels in 2 hours, per day (with pills and premium stamina). Why? Because the exp here.. Stay tune.. is 2.8KK /h. I have pretty good items, so I do not have any waste. But as far as I know, our Gohan/Trunks have a little bit waste.
So here are a few thoughts from my side. I hope they will be helpful for you. If you have any questions feel free to ask me anything, will try to answer as good as I can Additionally.. you weren't wrong. Toxic spiders are just.. bad, extremaly bad. I hate this spot with all of my heart - I trully do.
So in short.. awake your adventour spirit, get some items, discover new spots with your friend, aaaaand.. most important - HAVE FUN! This game is really something