IMHO, unless your TV's axle can NOT handle that weight, it is okay, as the range I shoot for is 15%-20%. That is the 'why' OEM's list 10% tongue weight trailers, as that keeps the TV's rear GAWR from becoming an issue
Maybe check the pointing of your trailer
It should be level at it's highest pointing and my preference is to point slightly down below level
On tires...the sidewall 'stiffness' and 'strength' is what it is all about when folks recommend going to next higher class tire...first order is whether the tires are rated for the weight carry molded into its sidewall
Lower profile "P" class helps, as there is less sidewall to flex.Going up to the next class tire, "LT", has the sidewalls designed and constructed with higher strength materials...and more of it. Why the exact same tire from the same OEM, same model, same size, etc will have the higher class tire cost more and weigh more
Wider rims (over stock) also helps, as it has less sidewall bend-back. So the sidewalls are 'straighter' and less likely to bend/fold/roll over the rim
Note that these things improves performance...but...reduces 'ride quality'. If 'ride quality' is higher than 'performance' on your 'have to have' list, then decide whether to go this route on tires or not. Trailer pointing should not affect ride quality and improves how the trailer follows the TV
Finally, if the Blue Ox (my choice and recommendation for most applications) doesn't 'center' the trailer fast enough for your tasts, consider adding a friction bar kit