ok, now I have maximum time to reply and not on my phone.
you say your test dose is 261mg and you want to round up to 300, why not round down to 250, and then you have room for other substances.
So let's look at the options here, you are 87kgs, so if you want to apply a reasonable amount of gear and you are nearly 50, I wouldn't go over 12mg per kg. I personally feel 10mg per kg per week is a better option.
Tren will wreck your lipid profile and can be harsh on the kidneys. Know what also can affect renal health? Equi. Also, both have been known to increase anxiety issues. Also, tren wrecks your sleep. so not gonna be great for recovery.
DHT substances seem to be way less harsh on those profiles, and deca/npp is way easier on the lipids and kidneys.
so if you play this out and you max out at 12mg per kg, 1044mg (1050 just for this example) you would break it down as follows.
starting dose : 6mg per kg 250mg test 150 deca/NPP, 150mg masteron or primo.
next bump up, 9mg per kg. 250mg test 250mg Deca/NPP, 250mg masteron or primo
last bump up, 12mg per kg: 250mg test 250mg Deca/NPP, 250mg masteron or primo and you could add in an oral at this stage based on performance aspects. Battling for the drive in the gym? anadrol/t-bol pre-workout. if you are battling more with recovery ANAVAR post-workout and before bed. or you could bump up the deca/npp dosage and the masteron primo dosage, all depending on which you are using.
personally, equi can be a great compound, but remember, each drug has a certain application. if you were an endurance athlete, then yeah sure, go for the equi option instead of test. from what I think you are looking at is lean hard muscle tissue with some size which is deca's favorite place to play.
then you look at the nutrition aspects: start your calories at a certain level, let's say 26kcal per kg, every time you go up in weight you add more food, every time you bump up the gear you add more food. New muscle tissue is going to need more calories. The more calories you take in, the more you grow.
training: make sure that you are able to recover, 4-5 weeks smashing heavy weights, 1 week 75% maximum volume and weight, back again. That will save your joints etc. Sleep, make sure that is good, so you can recover. With sleep an increase in food and smart training, you will be guaranteed to grow. its that simple